Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 20543:e7d0505c8a30
8059758: Footprint regressions with JDK-8038423
Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything.
Reviewed-by: jwilhelm, brutisso
| author | tschatzl |
|---|---|
| date | Fri, 10 Oct 2014 15:51:58 +0200 |
| parents | c02ec279b062 |
| children | b12a2a9b05ca |
| rev | line source |
|---|---|
| 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 | |
| 20543 | 133 void CMBitMapMappingChangedListener::on_commit(uint start_region, size_t num_regions, bool zero_filled) { |
| 134 if (zero_filled) { | |
| 135 return; | |
| 136 } | |
| 20337 | 137 // We need to clear the bitmap on commit, removing any existing information. |
| 138 MemRegion mr(G1CollectedHeap::heap()->bottom_addr_for_region(start_region), num_regions * HeapRegion::GrainWords); | |
| 139 _bm->clearRange(mr); | |
| 140 } | |
| 141 | |
| 142 // Closure used for clearing the given mark bitmap. | |
| 143 class ClearBitmapHRClosure : public HeapRegionClosure { | |
| 144 private: | |
| 145 ConcurrentMark* _cm; | |
| 146 CMBitMap* _bitmap; | |
| 147 bool _may_yield; // The closure may yield during iteration. If yielded, abort the iteration. | |
| 148 public: | |
| 149 ClearBitmapHRClosure(ConcurrentMark* cm, CMBitMap* bitmap, bool may_yield) : HeapRegionClosure(), _cm(cm), _bitmap(bitmap), _may_yield(may_yield) { | |
| 150 assert(!may_yield || cm != NULL, "CM must be non-NULL if this closure is expected to yield."); | |
| 151 } | |
| 152 | |
| 153 virtual bool doHeapRegion(HeapRegion* r) { | |
| 154 size_t const chunk_size_in_words = M / HeapWordSize; | |
| 155 | |
| 156 HeapWord* cur = r->bottom(); | |
| 157 HeapWord* const end = r->end(); | |
| 158 | |
| 159 while (cur < end) { | |
| 160 MemRegion mr(cur, MIN2(cur + chunk_size_in_words, end)); | |
| 161 _bitmap->clearRange(mr); | |
| 162 | |
| 163 cur += chunk_size_in_words; | |
| 164 | |
| 165 // Abort iteration if after yielding the marking has been aborted. | |
| 166 if (_may_yield && _cm->do_yield_check() && _cm->has_aborted()) { | |
| 167 return true; | |
| 168 } | |
| 169 // Repeat the asserts from before the start of the closure. We will do them | |
| 170 // as asserts here to minimize their overhead on the product. However, we | |
| 171 // will have them as guarantees at the beginning / end of the bitmap | |
| 172 // clearing to get some checking in the product. | |
| 173 assert(!_may_yield || _cm->cmThread()->during_cycle(), "invariant"); | |
| 174 assert(!_may_yield || !G1CollectedHeap::heap()->mark_in_progress(), "invariant"); | |
| 175 } | |
| 176 | |
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177 return false; |
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178 } |
| 20337 | 179 }; |
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180 |
| 342 | 181 void CMBitMap::clearAll() { |
| 20337 | 182 ClearBitmapHRClosure cl(NULL, this, false /* may_yield */); |
| 183 G1CollectedHeap::heap()->heap_region_iterate(&cl); | |
| 184 guarantee(cl.complete(), "Must have completed iteration."); | |
| 342 | 185 return; |
| 186 } | |
| 187 | |
| 188 void CMBitMap::markRange(MemRegion mr) { | |
| 189 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
| 190 assert(!mr.is_empty(), "unexpected empty region"); | |
| 191 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
| 192 ((HeapWord *) mr.end())), | |
| 193 "markRange memory region end is not card aligned"); | |
| 194 // convert address range into offset range | |
| 195 _bm.at_put_range(heapWordToOffset(mr.start()), | |
| 196 heapWordToOffset(mr.end()), true); | |
| 197 } | |
| 198 | |
| 199 void CMBitMap::clearRange(MemRegion mr) { | |
| 200 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
| 201 assert(!mr.is_empty(), "unexpected empty region"); | |
| 202 // convert address range into offset range | |
| 203 _bm.at_put_range(heapWordToOffset(mr.start()), | |
| 204 heapWordToOffset(mr.end()), false); | |
| 205 } | |
| 206 | |
| 207 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
| 208 HeapWord* end_addr) { | |
| 209 HeapWord* start = getNextMarkedWordAddress(addr); | |
| 210 start = MIN2(start, end_addr); | |
| 211 HeapWord* end = getNextUnmarkedWordAddress(start); | |
| 212 end = MIN2(end, end_addr); | |
| 213 assert(start <= end, "Consistency check"); | |
| 214 MemRegion mr(start, end); | |
| 215 if (!mr.is_empty()) { | |
| 216 clearRange(mr); | |
| 217 } | |
| 218 return mr; | |
| 219 } | |
| 220 | |
| 221 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
| 222 _base(NULL), _cm(cm) | |
| 223 #ifdef ASSERT | |
| 224 , _drain_in_progress(false) | |
| 225 , _drain_in_progress_yields(false) | |
| 226 #endif | |
| 227 {} | |
| 228 | |
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229 bool CMMarkStack::allocate(size_t capacity) { |
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230 // allocate a stack of the requisite depth |
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231 ReservedSpace rs(ReservedSpace::allocation_align_size_up(capacity * sizeof(oop))); |
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232 if (!rs.is_reserved()) { |
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233 warning("ConcurrentMark MarkStack allocation failure"); |
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234 return false; |
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235 } |
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236 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); |
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237 if (!_virtual_space.initialize(rs, rs.size())) { |
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238 warning("ConcurrentMark MarkStack backing store failure"); |
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239 // Release the virtual memory reserved for the marking stack |
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240 rs.release(); |
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241 return false; |
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242 } |
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243 assert(_virtual_space.committed_size() == rs.size(), |
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244 "Didn't reserve backing store for all of ConcurrentMark stack?"); |
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245 _base = (oop*) _virtual_space.low(); |
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246 setEmpty(); |
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247 _capacity = (jint) capacity; |
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248 _saved_index = -1; |
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249 _should_expand = false; |
| 342 | 250 NOT_PRODUCT(_max_depth = 0); |
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251 return true; |
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252 } |
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253 |
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254 void CMMarkStack::expand() { |
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255 // Called, during remark, if we've overflown the marking stack during marking. |
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256 assert(isEmpty(), "stack should been emptied while handling overflow"); |
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257 assert(_capacity <= (jint) MarkStackSizeMax, "stack bigger than permitted"); |
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258 // Clear expansion flag |
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259 _should_expand = false; |
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260 if (_capacity == (jint) MarkStackSizeMax) { |
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261 if (PrintGCDetails && Verbose) { |
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262 gclog_or_tty->print_cr(" (benign) Can't expand marking stack capacity, at max size limit"); |
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263 } |
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264 return; |
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265 } |
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266 // Double capacity if possible |
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267 jint new_capacity = MIN2(_capacity*2, (jint) MarkStackSizeMax); |
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268 // Do not give up existing stack until we have managed to |
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269 // get the double capacity that we desired. |
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270 ReservedSpace rs(ReservedSpace::allocation_align_size_up(new_capacity * |
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271 sizeof(oop))); |
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272 if (rs.is_reserved()) { |
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273 // Release the backing store associated with old stack |
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274 _virtual_space.release(); |
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275 // Reinitialize virtual space for new stack |
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276 if (!_virtual_space.initialize(rs, rs.size())) { |
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277 fatal("Not enough swap for expanded marking stack capacity"); |
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278 } |
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279 _base = (oop*)(_virtual_space.low()); |
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280 _index = 0; |
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281 _capacity = new_capacity; |
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282 } else { |
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283 if (PrintGCDetails && Verbose) { |
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284 // Failed to double capacity, continue; |
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285 gclog_or_tty->print(" (benign) Failed to expand marking stack capacity from " |
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286 SIZE_FORMAT"K to " SIZE_FORMAT"K", |
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287 _capacity / K, new_capacity / K); |
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288 } |
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289 } |
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290 } |
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291 |
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292 void CMMarkStack::set_should_expand() { |
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293 // If we're resetting the marking state because of an |
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294 // marking stack overflow, record that we should, if |
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295 // possible, expand the stack. |
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296 _should_expand = _cm->has_overflown(); |
| 342 | 297 } |
| 298 | |
| 299 CMMarkStack::~CMMarkStack() { | |
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300 if (_base != NULL) { |
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301 _base = NULL; |
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302 _virtual_space.release(); |
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303 } |
| 342 | 304 } |
| 305 | |
| 306 void CMMarkStack::par_push(oop ptr) { | |
| 307 while (true) { | |
| 308 if (isFull()) { | |
| 309 _overflow = true; | |
| 310 return; | |
| 311 } | |
| 312 // Otherwise... | |
| 313 jint index = _index; | |
| 314 jint next_index = index+1; | |
| 315 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 316 if (res == index) { | |
| 317 _base[index] = ptr; | |
| 318 // Note that we don't maintain this atomically. We could, but it | |
| 319 // doesn't seem necessary. | |
| 320 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
| 321 return; | |
| 322 } | |
| 323 // Otherwise, we need to try again. | |
| 324 } | |
| 325 } | |
| 326 | |
| 327 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
| 328 while (true) { | |
| 329 if (isFull()) { | |
| 330 _overflow = true; | |
| 331 return; | |
| 332 } | |
| 333 // Otherwise... | |
| 334 jint index = _index; | |
| 335 jint next_index = index + n; | |
| 336 if (next_index > _capacity) { | |
| 337 _overflow = true; | |
| 338 return; | |
| 339 } | |
| 340 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 341 if (res == index) { | |
| 342 for (int i = 0; i < n; i++) { | |
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343 int ind = index + i; |
| 342 | 344 assert(ind < _capacity, "By overflow test above."); |
| 345 _base[ind] = ptr_arr[i]; | |
| 346 } | |
| 347 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
| 348 return; | |
| 349 } | |
| 350 // Otherwise, we need to try again. | |
| 351 } | |
| 352 } | |
| 353 | |
| 354 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
| 355 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 356 jint start = _index; | |
| 357 jint next_index = start + n; | |
| 358 if (next_index > _capacity) { | |
| 359 _overflow = true; | |
| 360 return; | |
| 361 } | |
| 362 // Otherwise. | |
| 363 _index = next_index; | |
| 364 for (int i = 0; i < n; i++) { | |
| 365 int ind = start + i; | |
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366 assert(ind < _capacity, "By overflow test above."); |
| 342 | 367 _base[ind] = ptr_arr[i]; |
| 368 } | |
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369 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); |
| 342 | 370 } |
| 371 | |
| 372 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
| 373 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 374 jint index = _index; | |
| 375 if (index == 0) { | |
| 376 *n = 0; | |
| 377 return false; | |
| 378 } else { | |
| 379 int k = MIN2(max, index); | |
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380 jint new_ind = index - k; |
| 342 | 381 for (int j = 0; j < k; j++) { |
| 382 ptr_arr[j] = _base[new_ind + j]; | |
| 383 } | |
| 384 _index = new_ind; | |
| 385 *n = k; | |
| 386 return true; | |
| 387 } | |
| 388 } | |
| 389 | |
| 390 template<class OopClosureClass> | |
| 391 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
| 392 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
| 393 || SafepointSynchronize::is_at_safepoint(), | |
| 394 "Drain recursion must be yield-safe."); | |
| 395 bool res = true; | |
| 396 debug_only(_drain_in_progress = true); | |
| 397 debug_only(_drain_in_progress_yields = yield_after); | |
| 398 while (!isEmpty()) { | |
| 399 oop newOop = pop(); | |
| 400 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
| 401 assert(newOop->is_oop(), "Expected an oop"); | |
| 402 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
| 403 "only grey objects on this stack"); | |
| 404 newOop->oop_iterate(cl); | |
| 405 if (yield_after && _cm->do_yield_check()) { | |
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406 res = false; |
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407 break; |
| 342 | 408 } |
| 409 } | |
| 410 debug_only(_drain_in_progress = false); | |
| 411 return res; | |
| 412 } | |
| 413 | |
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414 void CMMarkStack::note_start_of_gc() { |
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415 assert(_saved_index == -1, |
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416 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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417 _saved_index = _index; |
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418 } |
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419 |
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420 void CMMarkStack::note_end_of_gc() { |
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421 // This is intentionally a guarantee, instead of an assert. If we |
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422 // accidentally add something to the mark stack during GC, it |
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423 // will be a correctness issue so it's better if we crash. we'll |
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424 // only check this once per GC anyway, so it won't be a performance |
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425 // issue in any way. |
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426 guarantee(_saved_index == _index, |
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427 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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428 _saved_index = -1; |
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429 } |
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430 |
| 342 | 431 void CMMarkStack::oops_do(OopClosure* f) { |
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432 assert(_saved_index == _index, |
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433 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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434 for (int i = 0; i < _index; i += 1) { |
| 342 | 435 f->do_oop(&_base[i]); |
| 436 } | |
| 437 } | |
| 438 | |
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439 CMRootRegions::CMRootRegions() : |
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440 _young_list(NULL), _cm(NULL), _scan_in_progress(false), |
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441 _should_abort(false), _next_survivor(NULL) { } |
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442 |
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443 void CMRootRegions::init(G1CollectedHeap* g1h, ConcurrentMark* cm) { |
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444 _young_list = g1h->young_list(); |
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445 _cm = cm; |
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446 } |
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447 |
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448 void CMRootRegions::prepare_for_scan() { |
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449 assert(!scan_in_progress(), "pre-condition"); |
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450 |
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451 // Currently, only survivors can be root regions. |
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452 assert(_next_survivor == NULL, "pre-condition"); |
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453 _next_survivor = _young_list->first_survivor_region(); |
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454 _scan_in_progress = (_next_survivor != NULL); |
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455 _should_abort = false; |
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456 } |
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457 |
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458 HeapRegion* CMRootRegions::claim_next() { |
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459 if (_should_abort) { |
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460 // If someone has set the should_abort flag, we return NULL to |
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461 // force the caller to bail out of their loop. |
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462 return NULL; |
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463 } |
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464 |
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465 // Currently, only survivors can be root regions. |
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466 HeapRegion* res = _next_survivor; |
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467 if (res != NULL) { |
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468 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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469 // Read it again in case it changed while we were waiting for the lock. |
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470 res = _next_survivor; |
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471 if (res != NULL) { |
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472 if (res == _young_list->last_survivor_region()) { |
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473 // We just claimed the last survivor so store NULL to indicate |
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474 // that we're done. |
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475 _next_survivor = NULL; |
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476 } else { |
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477 _next_survivor = res->get_next_young_region(); |
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478 } |
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479 } else { |
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480 // Someone else claimed the last survivor while we were trying |
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481 // to take the lock so nothing else to do. |
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482 } |
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483 } |
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484 assert(res == NULL || res->is_survivor(), "post-condition"); |
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485 |
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486 return res; |
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487 } |
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488 |
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489 void CMRootRegions::scan_finished() { |
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490 assert(scan_in_progress(), "pre-condition"); |
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491 |
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492 // Currently, only survivors can be root regions. |
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493 if (!_should_abort) { |
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494 assert(_next_survivor == NULL, "we should have claimed all survivors"); |
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495 } |
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496 _next_survivor = NULL; |
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497 |
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498 { |
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499 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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500 _scan_in_progress = false; |
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501 RootRegionScan_lock->notify_all(); |
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502 } |
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503 } |
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504 |
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505 bool CMRootRegions::wait_until_scan_finished() { |
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506 if (!scan_in_progress()) return false; |
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507 |
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508 { |
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509 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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510 while (scan_in_progress()) { |
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511 RootRegionScan_lock->wait(Mutex::_no_safepoint_check_flag); |
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512 } |
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513 } |
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514 return true; |
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515 } |
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516 |
| 342 | 517 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
| 518 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 519 #endif // _MSC_VER | |
| 520 | |
|
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521 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
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522 return MAX2((n_par_threads + 2) / 4, 1U); |
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523 } |
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524 |
| 20337 | 525 ConcurrentMark::ConcurrentMark(G1CollectedHeap* g1h, G1RegionToSpaceMapper* prev_bitmap_storage, G1RegionToSpaceMapper* next_bitmap_storage) : |
|
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526 _g1h(g1h), |
| 20337 | 527 _markBitMap1(), |
| 528 _markBitMap2(), | |
| 342 | 529 _parallel_marking_threads(0), |
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530 _max_parallel_marking_threads(0), |
| 342 | 531 _sleep_factor(0.0), |
| 532 _marking_task_overhead(1.0), | |
| 533 _cleanup_sleep_factor(0.0), | |
| 534 _cleanup_task_overhead(1.0), | |
| 2152 | 535 _cleanup_list("Cleanup List"), |
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536 _region_bm((BitMap::idx_t)(g1h->max_regions()), false /* in_resource_area*/), |
| 20337 | 537 _card_bm((g1h->reserved_region().byte_size() + CardTableModRefBS::card_size - 1) >> |
|
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538 CardTableModRefBS::card_shift, |
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539 false /* in_resource_area*/), |
|
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540 |
| 342 | 541 _prevMarkBitMap(&_markBitMap1), |
| 542 _nextMarkBitMap(&_markBitMap2), | |
| 543 | |
| 544 _markStack(this), | |
| 545 // _finger set in set_non_marking_state | |
| 546 | |
|
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547 _max_worker_id(MAX2((uint)ParallelGCThreads, 1U)), |
| 342 | 548 // _active_tasks set in set_non_marking_state |
| 549 // _tasks set inside the constructor | |
|
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550 _task_queues(new CMTaskQueueSet((int) _max_worker_id)), |
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551 _terminator(ParallelTaskTerminator((int) _max_worker_id, _task_queues)), |
| 342 | 552 |
| 553 _has_overflown(false), | |
| 554 _concurrent(false), | |
|
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555 _has_aborted(false), |
|
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556 _aborted_gc_id(GCId::undefined()), |
|
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557 _restart_for_overflow(false), |
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558 _concurrent_marking_in_progress(false), |
| 342 | 559 |
| 560 // _verbose_level set below | |
| 561 | |
| 562 _init_times(), | |
| 563 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
| 564 _cleanup_times(), | |
| 565 _total_counting_time(0.0), | |
| 566 _total_rs_scrub_time(0.0), | |
|
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567 |
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568 _parallel_workers(NULL), |
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569 |
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570 _count_card_bitmaps(NULL), |
|
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571 _count_marked_bytes(NULL), |
|
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572 _completed_initialization(false) { |
|
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573 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
|
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574 if (verbose_level < no_verbose) { |
| 342 | 575 verbose_level = no_verbose; |
|
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576 } |
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577 if (verbose_level > high_verbose) { |
| 342 | 578 verbose_level = high_verbose; |
|
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579 } |
| 342 | 580 _verbose_level = verbose_level; |
| 581 | |
|
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582 if (verbose_low()) { |
| 342 | 583 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
|
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584 "heap end = " INTPTR_FORMAT, p2i(_heap_start), p2i(_heap_end)); |
|
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585 } |
| 342 | 586 |
| 20337 | 587 _markBitMap1.initialize(g1h->reserved_region(), prev_bitmap_storage); |
| 588 _markBitMap2.initialize(g1h->reserved_region(), next_bitmap_storage); | |
| 342 | 589 |
| 590 // Create & start a ConcurrentMark thread. | |
|
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591 _cmThread = new ConcurrentMarkThread(this); |
|
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592 assert(cmThread() != NULL, "CM Thread should have been created"); |
|
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593 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
|
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594 if (_cmThread->osthread() == NULL) { |
|
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595 vm_shutdown_during_initialization("Could not create ConcurrentMarkThread"); |
|
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596 } |
|
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597 |
| 342 | 598 assert(CGC_lock != NULL, "Where's the CGC_lock?"); |
| 20337 | 599 assert(_markBitMap1.covers(g1h->reserved_region()), "_markBitMap1 inconsistency"); |
| 600 assert(_markBitMap2.covers(g1h->reserved_region()), "_markBitMap2 inconsistency"); | |
| 342 | 601 |
| 602 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
| 1282 | 603 satb_qs.set_buffer_size(G1SATBBufferSize); |
| 342 | 604 |
|
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605 _root_regions.init(_g1h, this); |
|
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606 |
| 1284 | 607 if (ConcGCThreads > ParallelGCThreads) { |
|
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608 warning("Can't have more ConcGCThreads (" UINTX_FORMAT ") " |
|
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609 "than ParallelGCThreads (" UINTX_FORMAT ").", |
|
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610 ConcGCThreads, ParallelGCThreads); |
|
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611 return; |
| 342 | 612 } |
| 613 if (ParallelGCThreads == 0) { | |
| 614 // if we are not running with any parallel GC threads we will not | |
| 615 // spawn any marking threads either | |
|
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616 _parallel_marking_threads = 0; |
|
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617 _max_parallel_marking_threads = 0; |
|
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618 _sleep_factor = 0.0; |
|
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619 _marking_task_overhead = 1.0; |
| 342 | 620 } else { |
|
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621 if (!FLAG_IS_DEFAULT(ConcGCThreads) && ConcGCThreads > 0) { |
|
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622 // Note: ConcGCThreads has precedence over G1MarkingOverheadPercent |
| 342 | 623 // if both are set |
| 624 _sleep_factor = 0.0; | |
| 625 _marking_task_overhead = 1.0; | |
| 751 | 626 } else if (G1MarkingOverheadPercent > 0) { |
|
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627 // We will calculate the number of parallel marking threads based |
|
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628 // on a target overhead with respect to the soft real-time goal |
| 751 | 629 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
| 342 | 630 double overall_cm_overhead = |
| 751 | 631 (double) MaxGCPauseMillis * marking_overhead / |
| 632 (double) GCPauseIntervalMillis; | |
| 342 | 633 double cpu_ratio = 1.0 / (double) os::processor_count(); |
| 634 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
| 635 double marking_task_overhead = | |
| 636 overall_cm_overhead / marking_thread_num * | |
| 637 (double) os::processor_count(); | |
| 638 double sleep_factor = | |
| 639 (1.0 - marking_task_overhead) / marking_task_overhead; | |
| 640 | |
|
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|
641 FLAG_SET_ERGO(uintx, ConcGCThreads, (uint) marking_thread_num); |
| 342 | 642 _sleep_factor = sleep_factor; |
| 643 _marking_task_overhead = marking_task_overhead; | |
| 644 } else { | |
|
8006
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|
645 // Calculate the number of parallel marking threads by scaling |
|
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|
646 // the number of parallel GC threads. |
|
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|
647 uint marking_thread_num = scale_parallel_threads((uint) ParallelGCThreads); |
|
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|
648 FLAG_SET_ERGO(uintx, ConcGCThreads, marking_thread_num); |
| 342 | 649 _sleep_factor = 0.0; |
| 650 _marking_task_overhead = 1.0; | |
| 651 } | |
| 652 | |
|
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653 assert(ConcGCThreads > 0, "Should have been set"); |
|
4700e77d44c1
8006894: G1: Number of marking threads missing from PrintFlagsFinal output
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|
654 _parallel_marking_threads = (uint) ConcGCThreads; |
|
4700e77d44c1
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|
655 _max_parallel_marking_threads = _parallel_marking_threads; |
|
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|
656 |
|
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7055073: G1: code cleanup in the concurrentMark.* files
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|
657 if (parallel_marking_threads() > 1) { |
| 342 | 658 _cleanup_task_overhead = 1.0; |
|
3776
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|
659 } else { |
| 342 | 660 _cleanup_task_overhead = marking_task_overhead(); |
|
3776
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|
661 } |
| 342 | 662 _cleanup_sleep_factor = |
| 663 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
| 664 | |
| 665 #if 0 | |
| 666 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
| 667 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
| 668 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
| 669 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
| 670 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
| 671 #endif | |
| 672 | |
|
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|
673 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
|
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6984287: Regularize how GC parallel workers are specified.
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|
674 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
|
4728
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7121618: Change type of number of GC workers to unsigned int.
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|
675 _max_parallel_marking_threads, false, true); |
|
1833
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|
676 if (_parallel_workers == NULL) { |
| 342 | 677 vm_exit_during_initialization("Failed necessary allocation."); |
|
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|
678 } else { |
|
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|
679 _parallel_workers->initialize_workers(); |
|
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|
680 } |
| 342 | 681 } |
| 682 | |
|
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|
683 if (FLAG_IS_DEFAULT(MarkStackSize)) { |
|
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|
684 uintx mark_stack_size = |
|
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|
685 MIN2(MarkStackSizeMax, |
|
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|
686 MAX2(MarkStackSize, (uintx) (parallel_marking_threads() * TASKQUEUE_SIZE))); |
|
442f942757c0
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|
687 // Verify that the calculated value for MarkStackSize is in range. |
|
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|
688 // It would be nice to use the private utility routine from Arguments. |
|
442f942757c0
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|
689 if (!(mark_stack_size >= 1 && mark_stack_size <= MarkStackSizeMax)) { |
|
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|
690 warning("Invalid value calculated for MarkStackSize (" UINTX_FORMAT "): " |
|
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|
691 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
|
17937
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|
692 mark_stack_size, (uintx) 1, MarkStackSizeMax); |
|
7397
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|
693 return; |
|
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|
694 } |
|
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|
695 FLAG_SET_ERGO(uintx, MarkStackSize, mark_stack_size); |
|
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|
696 } else { |
|
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|
697 // Verify MarkStackSize is in range. |
|
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|
698 if (FLAG_IS_CMDLINE(MarkStackSize)) { |
|
442f942757c0
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|
699 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { |
|
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|
700 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
|
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|
701 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT "): " |
|
442f942757c0
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|
702 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
|
17937
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8037816: Fix for 8036122 breaks build with Xcode5/clang
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|
703 MarkStackSize, (uintx) 1, MarkStackSizeMax); |
|
7397
442f942757c0
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|
704 return; |
|
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|
705 } |
|
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|
706 } else if (FLAG_IS_CMDLINE(MarkStackSizeMax)) { |
|
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|
707 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
|
442f942757c0
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|
708 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT ")" |
|
442f942757c0
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|
709 " or for MarkStackSizeMax (" UINTX_FORMAT ")", |
|
442f942757c0
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|
710 MarkStackSize, MarkStackSizeMax); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
711 return; |
|
442f942757c0
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|
712 } |
|
442f942757c0
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diff
changeset
|
713 } |
|
442f942757c0
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diff
changeset
|
714 } |
|
442f942757c0
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|
715 } |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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diff
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|
716 |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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changeset
|
717 if (!_markStack.allocate(MarkStackSize)) { |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
718 warning("Failed to allocate CM marking stack"); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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changeset
|
719 return; |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
720 } |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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diff
changeset
|
721 |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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changeset
|
722 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_worker_id, mtGC); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
723 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_worker_id, mtGC); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
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diff
changeset
|
724 |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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changeset
|
725 _count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_worker_id, mtGC); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
726 _count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_worker_id, mtGC); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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diff
changeset
|
727 |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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diff
changeset
|
728 BitMap::idx_t card_bm_size = _card_bm.size(); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
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diff
changeset
|
729 |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
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diff
changeset
|
730 // so that the assertion in MarkingTaskQueue::task_queue doesn't fail |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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diff
changeset
|
731 _active_tasks = _max_worker_id; |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
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diff
changeset
|
732 |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
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diff
changeset
|
733 size_t max_regions = (size_t) _g1h->max_regions(); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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diff
changeset
|
734 for (uint i = 0; i < _max_worker_id; ++i) { |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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diff
changeset
|
735 CMTaskQueue* task_queue = new CMTaskQueue(); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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diff
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|
736 task_queue->initialize(); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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changeset
|
737 _task_queues->register_queue(i, task_queue); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
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diff
changeset
|
738 |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
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diff
changeset
|
739 _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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diff
changeset
|
740 _count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, max_regions, mtGC); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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diff
changeset
|
741 |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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diff
changeset
|
742 _tasks[i] = new CMTask(i, this, |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
743 _count_marked_bytes[i], |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
744 &_count_card_bitmaps[i], |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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diff
changeset
|
745 task_queue, _task_queues); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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diff
changeset
|
746 |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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diff
changeset
|
747 _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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diff
changeset
|
748 } |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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diff
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|
749 |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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diff
changeset
|
750 // Calculate the card number for the bottom of the heap. Used |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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diff
changeset
|
751 // in biasing indexes into the accounting card bitmaps. |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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diff
changeset
|
752 _heap_bottom_card_num = |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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changeset
|
753 intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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diff
changeset
|
754 CardTableModRefBS::card_shift); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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diff
changeset
|
755 |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
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diff
changeset
|
756 // Clear all the liveness counting data |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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changeset
|
757 clear_all_count_data(); |
|
442f942757c0
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changeset
|
758 |
| 342 | 759 // so that the call below can read a sensible value |
| 20337 | 760 _heap_start = g1h->reserved_region().start(); |
| 342 | 761 set_non_marking_state(); |
|
7397
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|
762 _completed_initialization = true; |
| 342 | 763 } |
| 764 | |
| 765 void ConcurrentMark::reset() { | |
| 766 // Starting values for these two. This should be called in a STW | |
| 20337 | 767 // phase. |
| 768 MemRegion reserved = _g1h->g1_reserved(); | |
| 769 _heap_start = reserved.start(); | |
| 770 _heap_end = reserved.end(); | |
| 342 | 771 |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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diff
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|
772 // 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
|
773 assert(_heap_start != NULL, "heap bounds should look ok"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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1022
diff
changeset
|
774 assert(_heap_end != NULL, "heap bounds should look ok"); |
|
11d4857fe5e1
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tonyp
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1022
diff
changeset
|
775 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
| 342 | 776 |
|
7450
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
johnc
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diff
changeset
|
777 // Reset all the marking data structures and any necessary flags |
|
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
johnc
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diff
changeset
|
778 reset_marking_state(); |
| 342 | 779 |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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diff
changeset
|
780 if (verbose_low()) { |
| 342 | 781 gclog_or_tty->print_cr("[global] resetting"); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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|
782 } |
| 342 | 783 |
| 784 // We do reset all of them, since different phases will use | |
| 785 // different number of active threads. So, it's easiest to have all | |
| 786 // of them ready. | |
|
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787 for (uint i = 0; i < _max_worker_id; ++i) { |
| 342 | 788 _tasks[i]->reset(_nextMarkBitMap); |
|
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789 } |
| 342 | 790 |
| 791 // we need this to make sure that the flag is on during the evac | |
| 792 // pause with initial mark piggy-backed | |
| 793 set_concurrent_marking_in_progress(); | |
| 794 } | |
| 795 | |
|
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796 |
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797 void ConcurrentMark::reset_marking_state(bool clear_overflow) { |
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798 _markStack.set_should_expand(); |
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799 _markStack.setEmpty(); // Also clears the _markStack overflow flag |
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800 if (clear_overflow) { |
|
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801 clear_has_overflown(); |
|
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802 } else { |
|
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803 assert(has_overflown(), "pre-condition"); |
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804 } |
|
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805 _finger = _heap_start; |
|
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806 |
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807 for (uint i = 0; i < _max_worker_id; ++i) { |
|
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808 CMTaskQueue* queue = _task_queues->queue(i); |
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809 queue->set_empty(); |
|
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810 } |
|
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811 } |
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812 |
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813 void ConcurrentMark::set_concurrency(uint active_tasks) { |
|
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814 assert(active_tasks <= _max_worker_id, "we should not have more"); |
| 342 | 815 |
| 816 _active_tasks = active_tasks; | |
| 817 // Need to update the three data structures below according to the | |
| 818 // number of active threads for this phase. | |
| 819 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
| 820 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
| 821 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
|
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822 } |
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823 |
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824 void ConcurrentMark::set_concurrency_and_phase(uint active_tasks, bool concurrent) { |
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825 set_concurrency(active_tasks); |
| 342 | 826 |
| 827 _concurrent = concurrent; | |
| 828 // We propagate this to all tasks, not just the active ones. | |
|
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829 for (uint i = 0; i < _max_worker_id; ++i) |
| 342 | 830 _tasks[i]->set_concurrent(concurrent); |
| 831 | |
| 832 if (concurrent) { | |
| 833 set_concurrent_marking_in_progress(); | |
| 834 } else { | |
| 835 // We currently assume that the concurrent flag has been set to | |
| 836 // false before we start remark. At this point we should also be | |
| 837 // in a STW phase. | |
|
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838 assert(!concurrent_marking_in_progress(), "invariant"); |
|
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839 assert(out_of_regions(), |
|
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840 err_msg("only way to get here: _finger: "PTR_FORMAT", _heap_end: "PTR_FORMAT, |
|
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841 p2i(_finger), p2i(_heap_end))); |
| 342 | 842 } |
| 843 } | |
| 844 | |
| 845 void ConcurrentMark::set_non_marking_state() { | |
| 846 // We set the global marking state to some default values when we're | |
| 847 // not doing marking. | |
|
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848 reset_marking_state(); |
| 342 | 849 _active_tasks = 0; |
| 850 clear_concurrent_marking_in_progress(); | |
| 851 } | |
| 852 | |
| 853 ConcurrentMark::~ConcurrentMark() { | |
| 4735 | 854 // The ConcurrentMark instance is never freed. |
| 855 ShouldNotReachHere(); | |
| 342 | 856 } |
| 857 | |
| 858 void ConcurrentMark::clearNextBitmap() { | |
|
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859 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
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860 |
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861 // Make sure that the concurrent mark thread looks to still be in |
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862 // the current cycle. |
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863 guarantee(cmThread()->during_cycle(), "invariant"); |
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864 |
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865 // We are finishing up the current cycle by clearing the next |
|
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866 // marking bitmap and getting it ready for the next cycle. During |
|
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867 // this time no other cycle can start. So, let's make sure that this |
|
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868 // is the case. |
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869 guarantee(!g1h->mark_in_progress(), "invariant"); |
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870 |
| 20337 | 871 ClearBitmapHRClosure cl(this, _nextMarkBitMap, true /* may_yield */); |
| 872 g1h->heap_region_iterate(&cl); | |
| 873 | |
| 874 // Clear the liveness counting data. If the marking has been aborted, the abort() | |
| 875 // call already did that. | |
| 876 if (cl.complete()) { | |
| 877 clear_all_count_data(); | |
|
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878 } |
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879 |
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880 // Repeat the asserts from above. |
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881 guarantee(cmThread()->during_cycle(), "invariant"); |
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882 guarantee(!g1h->mark_in_progress(), "invariant"); |
| 342 | 883 } |
| 884 | |
| 20337 | 885 class CheckBitmapClearHRClosure : public HeapRegionClosure { |
| 886 CMBitMap* _bitmap; | |
| 887 bool _error; | |
| 888 public: | |
| 889 CheckBitmapClearHRClosure(CMBitMap* bitmap) : _bitmap(bitmap) { | |
| 890 } | |
| 891 | |
| 892 virtual bool doHeapRegion(HeapRegion* r) { | |
|
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893 // This closure can be called concurrently to the mutator, so we must make sure |
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894 // that the result of the getNextMarkedWordAddress() call is compared to the |
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895 // value passed to it as limit to detect any found bits. |
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896 // We can use the region's orig_end() for the limit and the comparison value |
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897 // as it always contains the "real" end of the region that never changes and |
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898 // has no side effects. |
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899 // Due to the latter, there can also be no problem with the compiler generating |
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900 // reloads of the orig_end() call. |
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901 HeapWord* end = r->orig_end(); |
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902 return _bitmap->getNextMarkedWordAddress(r->bottom(), end) != end; |
| 20337 | 903 } |
| 904 }; | |
| 905 | |
|
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|
906 bool ConcurrentMark::nextMarkBitmapIsClear() { |
| 20337 | 907 CheckBitmapClearHRClosure cl(_nextMarkBitMap); |
| 908 _g1h->heap_region_iterate(&cl); | |
| 909 return cl.complete(); | |
|
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910 } |
|
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911 |
| 342 | 912 class NoteStartOfMarkHRClosure: public HeapRegionClosure { |
| 913 public: | |
| 914 bool doHeapRegion(HeapRegion* r) { | |
| 915 if (!r->continuesHumongous()) { | |
|
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916 r->note_start_of_marking(); |
| 342 | 917 } |
| 918 return false; | |
| 919 } | |
| 920 }; | |
| 921 | |
| 922 void ConcurrentMark::checkpointRootsInitialPre() { | |
| 923 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 924 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
| 925 | |
| 926 _has_aborted = false; | |
| 927 | |
|
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928 #ifndef PRODUCT |
| 1044 | 929 if (G1PrintReachableAtInitialMark) { |
| 1388 | 930 print_reachable("at-cycle-start", |
|
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931 VerifyOption_G1UsePrevMarking, true /* all */); |
| 1044 | 932 } |
|
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933 #endif |
| 342 | 934 |
| 935 // Initialise marking structures. This has to be done in a STW phase. | |
| 936 reset(); | |
|
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937 |
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938 // For each region note start of marking. |
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939 NoteStartOfMarkHRClosure startcl; |
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940 g1h->heap_region_iterate(&startcl); |
| 342 | 941 } |
| 942 | |
| 943 | |
| 944 void ConcurrentMark::checkpointRootsInitialPost() { | |
| 945 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 946 | |
|
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947 // If we force an overflow during remark, the remark operation will |
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948 // actually abort and we'll restart concurrent marking. If we always |
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949 // force an oveflow during remark we'll never actually complete the |
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950 // marking phase. So, we initilize this here, at the start of the |
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951 // cycle, so that at the remaining overflow number will decrease at |
|
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952 // every remark and we'll eventually not need to cause one. |
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953 force_overflow_stw()->init(); |
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954 |
|
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955 // Start Concurrent Marking weak-reference discovery. |
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956 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
|
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957 // enable ("weak") refs discovery |
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958 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
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959 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
| 342 | 960 |
| 961 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
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962 // This is the start of the marking cycle, we're expected all |
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963 // threads to have SATB queues with active set to false. |
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964 satb_mq_set.set_active_all_threads(true, /* new active value */ |
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965 false /* expected_active */); |
| 342 | 966 |
|
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967 _root_regions.prepare_for_scan(); |
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968 |
| 342 | 969 // update_g1_committed() will be called at the end of an evac pause |
| 970 // when marking is on. So, it's also called at the end of the | |
| 971 // initial-mark pause to update the heap end, if the heap expands | |
| 972 // during it. No need to call it here. | |
| 973 } | |
| 974 | |
| 975 /* | |
|
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976 * Notice that in the next two methods, we actually leave the STS |
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977 * during the barrier sync and join it immediately afterwards. If we |
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978 * do not do this, the following deadlock can occur: one thread could |
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979 * be in the barrier sync code, waiting for the other thread to also |
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980 * sync up, whereas another one could be trying to yield, while also |
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981 * waiting for the other threads to sync up too. |
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982 * |
|
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983 * Note, however, that this code is also used during remark and in |
|
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984 * this case we should not attempt to leave / enter the STS, otherwise |
|
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985 * we'll either hit an asseert (debug / fastdebug) or deadlock |
|
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986 * (product). So we should only leave / enter the STS if we are |
|
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987 * operating concurrently. |
|
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988 * |
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989 * Because the thread that does the sync barrier has left the STS, it |
|
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990 * is possible to be suspended for a Full GC or an evacuation pause |
|
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991 * could occur. This is actually safe, since the entering the sync |
|
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992 * barrier is one of the last things do_marking_step() does, and it |
|
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993 * doesn't manipulate any data structures afterwards. |
|
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994 */ |
| 342 | 995 |
|
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996 void ConcurrentMark::enter_first_sync_barrier(uint worker_id) { |
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997 if (verbose_low()) { |
|
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998 gclog_or_tty->print_cr("[%u] entering first barrier", worker_id); |
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999 } |
| 342 | 1000 |
|
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1001 if (concurrent()) { |
| 20192 | 1002 SuspendibleThreadSet::leave(); |
|
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1003 } |
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1004 |
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1005 bool barrier_aborted = !_first_overflow_barrier_sync.enter(); |
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1006 |
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1007 if (concurrent()) { |
| 20192 | 1008 SuspendibleThreadSet::join(); |
|
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1009 } |
| 342 | 1010 // at this point everyone should have synced up and not be doing any |
| 1011 // more work | |
| 1012 | |
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1013 if (verbose_low()) { |
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1014 if (barrier_aborted) { |
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1015 gclog_or_tty->print_cr("[%u] aborted first barrier", worker_id); |
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1016 } else { |
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1017 gclog_or_tty->print_cr("[%u] leaving first barrier", worker_id); |
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1018 } |
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1019 } |
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1020 |
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1021 if (barrier_aborted) { |
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1022 // If the barrier aborted we ignore the overflow condition and |
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1023 // just abort the whole marking phase as quickly as possible. |
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1024 return; |
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1025 } |
| 342 | 1026 |
|
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1027 // If we're executing the concurrent phase of marking, reset the marking |
|
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1028 // state; otherwise the marking state is reset after reference processing, |
|
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1029 // during the remark pause. |
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1030 // If we reset here as a result of an overflow during the remark we will |
|
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1031 // see assertion failures from any subsequent set_concurrency_and_phase() |
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1032 // calls. |
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1033 if (concurrent()) { |
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1034 // let the task associated with with worker 0 do this |
|
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1035 if (worker_id == 0) { |
|
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1036 // task 0 is responsible for clearing the global data structures |
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1037 // We should be here because of an overflow. During STW we should |
|
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1038 // not clear the overflow flag since we rely on it being true when |
|
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1039 // we exit this method to abort the pause and restart concurent |
|
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1040 // marking. |
|
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1041 reset_marking_state(true /* clear_overflow */); |
|
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1042 force_overflow()->update(); |
|
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1043 |
|
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1044 if (G1Log::fine()) { |
|
20190
0982ec23da03
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1045 gclog_or_tty->gclog_stamp(concurrent_gc_id()); |
|
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1046 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); |
|
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1047 } |
| 342 | 1048 } |
| 1049 } | |
| 1050 | |
| 1051 // after this, each task should reset its own data structures then | |
| 1052 // then go into the second barrier | |
| 1053 } | |
| 1054 | |
|
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1055 void ConcurrentMark::enter_second_sync_barrier(uint worker_id) { |
|
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1056 if (verbose_low()) { |
|
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1057 gclog_or_tty->print_cr("[%u] entering second barrier", worker_id); |
|
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1058 } |
| 342 | 1059 |
|
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1060 if (concurrent()) { |
| 20192 | 1061 SuspendibleThreadSet::leave(); |
|
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1062 } |
|
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1063 |
|
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1064 bool barrier_aborted = !_second_overflow_barrier_sync.enter(); |
|
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1065 |
|
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1066 if (concurrent()) { |
| 20192 | 1067 SuspendibleThreadSet::join(); |
|
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1068 } |
|
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1069 // at this point everything should be re-initialized and ready to go |
| 342 | 1070 |
|
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1071 if (verbose_low()) { |
|
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1072 if (barrier_aborted) { |
|
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1073 gclog_or_tty->print_cr("[%u] aborted second barrier", worker_id); |
|
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1074 } else { |
|
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1075 gclog_or_tty->print_cr("[%u] leaving second barrier", worker_id); |
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1076 } |
|
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1077 } |
| 342 | 1078 } |
| 1079 | |
|
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1080 #ifndef PRODUCT |
|
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1081 void ForceOverflowSettings::init() { |
|
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1082 _num_remaining = G1ConcMarkForceOverflow; |
|
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1083 _force = false; |
|
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1084 update(); |
|
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1085 } |
|
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1086 |
|
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1087 void ForceOverflowSettings::update() { |
|
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1088 if (_num_remaining > 0) { |
|
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1089 _num_remaining -= 1; |
|
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1090 _force = true; |
|
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1091 } else { |
|
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1092 _force = false; |
|
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1093 } |
|
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1094 } |
|
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1095 |
|
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|
1096 bool ForceOverflowSettings::should_force() { |
|
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1097 if (_force) { |
|
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1098 _force = false; |
|
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1099 return true; |
|
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1100 } else { |
|
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1101 return false; |
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1102 } |
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1103 } |
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1104 #endif // !PRODUCT |
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1105 |
| 342 | 1106 class CMConcurrentMarkingTask: public AbstractGangTask { |
| 1107 private: | |
| 1108 ConcurrentMark* _cm; | |
| 1109 ConcurrentMarkThread* _cmt; | |
| 1110 | |
| 1111 public: | |
|
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1112 void work(uint worker_id) { |
|
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1113 assert(Thread::current()->is_ConcurrentGC_thread(), |
|
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1114 "this should only be done by a conc GC thread"); |
|
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1115 ResourceMark rm; |
| 342 | 1116 |
| 1117 double start_vtime = os::elapsedVTime(); | |
| 1118 | |
| 20192 | 1119 SuspendibleThreadSet::join(); |
| 342 | 1120 |
|
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1121 assert(worker_id < _cm->active_tasks(), "invariant"); |
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1122 CMTask* the_task = _cm->task(worker_id); |
| 342 | 1123 the_task->record_start_time(); |
| 1124 if (!_cm->has_aborted()) { | |
| 1125 do { | |
| 1126 double start_vtime_sec = os::elapsedVTime(); | |
|
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1127 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1128 |
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1129 the_task->do_marking_step(mark_step_duration_ms, |
|
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1130 true /* do_termination */, |
|
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1131 false /* is_serial*/); |
|
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1132 |
| 342 | 1133 double end_vtime_sec = os::elapsedVTime(); |
| 1134 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
| 1135 _cm->clear_has_overflown(); | |
| 1136 | |
|
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1137 _cm->do_yield_check(worker_id); |
| 342 | 1138 |
| 1139 jlong sleep_time_ms; | |
| 1140 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
| 1141 sleep_time_ms = | |
| 1142 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
| 20192 | 1143 SuspendibleThreadSet::leave(); |
| 342 | 1144 os::sleep(Thread::current(), sleep_time_ms, false); |
| 20192 | 1145 SuspendibleThreadSet::join(); |
| 342 | 1146 } |
| 1147 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
| 1148 } | |
| 1149 the_task->record_end_time(); | |
|
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1150 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
| 342 | 1151 |
| 20192 | 1152 SuspendibleThreadSet::leave(); |
| 342 | 1153 |
| 1154 double end_vtime = os::elapsedVTime(); | |
|
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1155 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
| 342 | 1156 } |
| 1157 | |
| 1158 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
| 1159 ConcurrentMarkThread* cmt) : | |
| 1160 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
| 1161 | |
| 1162 ~CMConcurrentMarkingTask() { } | |
| 1163 }; | |
| 1164 | |
|
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1165 // Calculates the number of active workers for a concurrent |
|
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1166 // phase. |
|
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1167 uint ConcurrentMark::calc_parallel_marking_threads() { |
| 4711 | 1168 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1169 uint n_conc_workers = 0; |
|
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1170 if (!UseDynamicNumberOfGCThreads || |
|
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1171 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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1172 !ForceDynamicNumberOfGCThreads)) { |
|
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1173 n_conc_workers = max_parallel_marking_threads(); |
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1174 } else { |
|
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1175 n_conc_workers = |
|
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1176 AdaptiveSizePolicy::calc_default_active_workers( |
|
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1177 max_parallel_marking_threads(), |
|
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1178 1, /* Minimum workers */ |
|
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1179 parallel_marking_threads(), |
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1180 Threads::number_of_non_daemon_threads()); |
|
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1181 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
|
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1182 // that scaling has already gone into "_max_parallel_marking_threads". |
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1183 } |
| 4711 | 1184 assert(n_conc_workers > 0, "Always need at least 1"); |
| 1185 return n_conc_workers; | |
|
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1186 } |
| 4711 | 1187 // If we are not running with any parallel GC threads we will not |
| 1188 // have spawned any marking threads either. Hence the number of | |
| 1189 // concurrent workers should be 0. | |
| 1190 return 0; | |
|
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1191 } |
|
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1192 |
|
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1193 void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
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1194 // Currently, only survivors can be root regions. |
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1195 assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
|
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1196 G1RootRegionScanClosure cl(_g1h, this, worker_id); |
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1197 |
|
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1198 const uintx interval = PrefetchScanIntervalInBytes; |
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1199 HeapWord* curr = hr->bottom(); |
|
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1200 const HeapWord* end = hr->top(); |
|
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1201 while (curr < end) { |
|
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1202 Prefetch::read(curr, interval); |
|
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1203 oop obj = oop(curr); |
|
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1204 int size = obj->oop_iterate(&cl); |
|
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1205 assert(size == obj->size(), "sanity"); |
|
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1206 curr += size; |
|
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1207 } |
|
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1208 } |
|
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1209 |
|
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1210 class CMRootRegionScanTask : public AbstractGangTask { |
|
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1211 private: |
|
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1212 ConcurrentMark* _cm; |
|
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1213 |
|
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1214 public: |
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1215 CMRootRegionScanTask(ConcurrentMark* cm) : |
|
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1216 AbstractGangTask("Root Region Scan"), _cm(cm) { } |
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1217 |
|
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1218 void work(uint worker_id) { |
|
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1219 assert(Thread::current()->is_ConcurrentGC_thread(), |
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1220 "this should only be done by a conc GC thread"); |
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1221 |
|
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1222 CMRootRegions* root_regions = _cm->root_regions(); |
|
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1223 HeapRegion* hr = root_regions->claim_next(); |
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1224 while (hr != NULL) { |
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1225 _cm->scanRootRegion(hr, worker_id); |
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1226 hr = root_regions->claim_next(); |
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1227 } |
|
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1228 } |
|
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1229 }; |
|
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1230 |
|
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1231 void ConcurrentMark::scanRootRegions() { |
|
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1232 // Start of concurrent marking. |
|
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1233 ClassLoaderDataGraph::clear_claimed_marks(); |
|
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1234 |
|
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1235 // scan_in_progress() will have been set to true only if there was |
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1236 // at least one root region to scan. So, if it's false, we |
|
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1237 // should not attempt to do any further work. |
|
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1238 if (root_regions()->scan_in_progress()) { |
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1239 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1240 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1241 "Maximum number of marking threads exceeded"); |
|
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1242 uint active_workers = MAX2(1U, parallel_marking_threads()); |
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1243 |
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1244 CMRootRegionScanTask task(this); |
|
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1245 if (use_parallel_marking_threads()) { |
|
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1246 _parallel_workers->set_active_workers((int) active_workers); |
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1247 _parallel_workers->run_task(&task); |
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1248 } else { |
|
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1249 task.work(0); |
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1250 } |
|
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1251 |
|
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1252 // It's possible that has_aborted() is true here without actually |
|
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1253 // aborting the survivor scan earlier. This is OK as it's |
|
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1254 // mainly used for sanity checking. |
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1255 root_regions()->scan_finished(); |
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1256 } |
|
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1257 } |
|
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1258 |
| 342 | 1259 void ConcurrentMark::markFromRoots() { |
| 1260 // we might be tempted to assert that: | |
| 1261 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
| 1262 // "inconsistent argument?"); | |
| 1263 // However that wouldn't be right, because it's possible that | |
| 1264 // a safepoint is indeed in progress as a younger generation | |
| 1265 // stop-the-world GC happens even as we mark in this generation. | |
| 1266 | |
| 1267 _restart_for_overflow = false; | |
|
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1268 force_overflow_conc()->init(); |
|
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1269 |
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1270 // _g1h has _n_par_threads |
|
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1271 _parallel_marking_threads = calc_parallel_marking_threads(); |
|
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1272 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
|
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1273 "Maximum number of marking threads exceeded"); |
| 4711 | 1274 |
|
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1275 uint active_workers = MAX2(1U, parallel_marking_threads()); |
| 4711 | 1276 |
|
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1277 // Parallel task terminator is set in "set_concurrency_and_phase()" |
|
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1278 set_concurrency_and_phase(active_workers, true /* concurrent */); |
| 342 | 1279 |
| 1280 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
|
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1281 if (use_parallel_marking_threads()) { |
| 4711 | 1282 _parallel_workers->set_active_workers((int)active_workers); |
|
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1283 // Don't set _n_par_threads because it affects MT in process_roots() |
| 4711 | 1284 // and the decisions on that MT processing is made elsewhere. |
| 1285 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
| 342 | 1286 _parallel_workers->run_task(&markingTask); |
|
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1287 } else { |
| 342 | 1288 markingTask.work(0); |
|
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|
1289 } |
| 342 | 1290 print_stats(); |
| 1291 } | |
| 1292 | |
| 1293 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
| 1294 // world is stopped at this checkpoint | |
| 1295 assert(SafepointSynchronize::is_at_safepoint(), | |
| 1296 "world should be stopped"); | |
|
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1297 |
| 342 | 1298 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 1299 | |
| 1300 // If a full collection has happened, we shouldn't do this. | |
| 1301 if (has_aborted()) { | |
| 1302 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 1303 return; | |
| 1304 } | |
| 1305 | |
|
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|
1306 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
|
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1307 |
|
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1308 if (VerifyDuringGC) { |
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1309 HandleMark hm; // handle scope |
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1310 Universe::heap()->prepare_for_verify(); |
|
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1311 Universe::verify(VerifyOption_G1UsePrevMarking, |
|
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1312 " VerifyDuringGC:(before)"); |
|
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1313 } |
|
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|
1314 g1h->check_bitmaps("Remark Start"); |
|
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1315 |
| 342 | 1316 G1CollectorPolicy* g1p = g1h->g1_policy(); |
| 1317 g1p->record_concurrent_mark_remark_start(); | |
| 1318 | |
| 1319 double start = os::elapsedTime(); | |
| 1320 | |
| 1321 checkpointRootsFinalWork(); | |
| 1322 | |
| 1323 double mark_work_end = os::elapsedTime(); | |
| 1324 | |
| 1325 weakRefsWork(clear_all_soft_refs); | |
| 1326 | |
| 1327 if (has_overflown()) { | |
| 1328 // Oops. We overflowed. Restart concurrent marking. | |
| 1329 _restart_for_overflow = true; | |
|
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|
1330 if (G1TraceMarkStackOverflow) { |
|
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|
1331 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
|
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|
1332 } |
|
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1333 |
|
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|
1334 // Verify the heap w.r.t. the previous marking bitmap. |
|
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|
1335 if (VerifyDuringGC) { |
|
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|
1336 HandleMark hm; // handle scope |
|
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1337 Universe::heap()->prepare_for_verify(); |
|
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1338 Universe::verify(VerifyOption_G1UsePrevMarking, |
|
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1339 " VerifyDuringGC:(overflow)"); |
|
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1340 } |
|
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1341 |
|
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1342 // Clear the marking state because we will be restarting |
|
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1343 // marking due to overflowing the global mark stack. |
|
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1344 reset_marking_state(); |
| 342 | 1345 } else { |
|
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1346 // Aggregate the per-task counting data that we have accumulated |
|
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1347 // while marking. |
|
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|
1348 aggregate_count_data(); |
|
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|
1349 |
| 2149 | 1350 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
| 342 | 1351 // We're done with marking. |
|
1317
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1352 // This is the end of the marking cycle, we're expected all |
|
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|
1353 // threads to have SATB queues with active set to true. |
| 2149 | 1354 satb_mq_set.set_active_all_threads(false, /* new active value */ |
| 1355 true /* expected_active */); | |
| 811 | 1356 |
| 1357 if (VerifyDuringGC) { | |
|
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|
1358 HandleMark hm; // handle scope |
|
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|
1359 Universe::heap()->prepare_for_verify(); |
|
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1360 Universe::verify(VerifyOption_G1UseNextMarking, |
|
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|
1361 " VerifyDuringGC:(after)"); |
| 811 | 1362 } |
|
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1363 g1h->check_bitmaps("Remark End"); |
|
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|
1364 assert(!restart_for_overflow(), "sanity"); |
|
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1365 // Completely reset the marking state since marking completed |
|
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1366 set_non_marking_state(); |
|
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|
1367 } |
|
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|
1368 |
|
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1369 // Expand the marking stack, if we have to and if we can. |
|
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|
1370 if (_markStack.should_expand()) { |
|
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|
1371 _markStack.expand(); |
|
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|
1372 } |
|
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|
1373 |
| 342 | 1374 // Statistics |
| 1375 double now = os::elapsedTime(); | |
| 1376 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
| 1377 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
| 1378 _remark_times.add((now - start) * 1000.0); | |
| 1379 | |
| 1380 g1p->record_concurrent_mark_remark_end(); | |
| 10405 | 1381 |
| 1382 G1CMIsAliveClosure is_alive(g1h); | |
| 1383 g1h->gc_tracer_cm()->report_object_count_after_gc(&is_alive); | |
| 342 | 1384 } |
| 1385 | |
|
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|
1386 // Base class of the closures that finalize and verify the |
|
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|
1387 // liveness counting data. |
|
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|
1388 class CMCountDataClosureBase: public HeapRegionClosure { |
|
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|
1389 protected: |
|
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|
1390 G1CollectedHeap* _g1h; |
| 342 | 1391 ConcurrentMark* _cm; |
|
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|
1392 CardTableModRefBS* _ct_bs; |
|
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|
1393 |
| 342 | 1394 BitMap* _region_bm; |
| 1395 BitMap* _card_bm; | |
|
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1396 |
|
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|
1397 // Takes a region that's not empty (i.e., it has at least one |
| 829 | 1398 // live object in it and sets its corresponding bit on the region |
| 1399 // bitmap to 1. If the region is "starts humongous" it will also set | |
| 1400 // to 1 the bits on the region bitmap that correspond to its | |
| 1401 // associated "continues humongous" regions. | |
| 1402 void set_bit_for_region(HeapRegion* hr) { | |
| 1403 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
| 1404 | |
|
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|
1405 BitMap::idx_t index = (BitMap::idx_t) hr->hrm_index(); |
| 829 | 1406 if (!hr->startsHumongous()) { |
| 1407 // Normal (non-humongous) case: just set the bit. | |
|
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|
1408 _region_bm->par_at_put(index, true); |
| 829 | 1409 } else { |
| 1410 // Starts humongous case: calculate how many regions are part of | |
|
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1411 // this humongous region and then set the bit range. |
|
6254
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|
1412 BitMap::idx_t end_index = (BitMap::idx_t) hr->last_hc_index(); |
|
6010
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|
1413 _region_bm->par_at_put_range(index, end_index, true); |
| 829 | 1414 } |
| 1415 } | |
| 1416 | |
|
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1417 public: |
|
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|
1418 CMCountDataClosureBase(G1CollectedHeap* g1h, |
|
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|
1419 BitMap* region_bm, BitMap* card_bm): |
|
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1420 _g1h(g1h), _cm(g1h->concurrent_mark()), |
|
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1421 _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
|
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1422 _region_bm(region_bm), _card_bm(card_bm) { } |
|
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1423 }; |
|
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1424 |
|
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|
1425 // Closure that calculates the # live objects per region. Used |
|
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1426 // for verification purposes during the cleanup pause. |
|
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|
1427 class CalcLiveObjectsClosure: public CMCountDataClosureBase { |
|
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|
1428 CMBitMapRO* _bm; |
|
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|
1429 size_t _region_marked_bytes; |
|
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1430 |
|
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|
1431 public: |
|
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|
1432 CalcLiveObjectsClosure(CMBitMapRO *bm, G1CollectedHeap* g1h, |
|
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|
1433 BitMap* region_bm, BitMap* card_bm) : |
|
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|
1434 CMCountDataClosureBase(g1h, region_bm, card_bm), |
|
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1435 _bm(bm), _region_marked_bytes(0) { } |
|
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1436 |
| 342 | 1437 bool doHeapRegion(HeapRegion* hr) { |
| 1438 | |
| 639 | 1439 if (hr->continuesHumongous()) { |
| 829 | 1440 // We will ignore these here and process them when their |
| 1441 // associated "starts humongous" region is processed (see | |
| 1442 // set_bit_for_heap_region()). Note that we cannot rely on their | |
| 1443 // associated "starts humongous" region to have their bit set to | |
| 1444 // 1 since, due to the region chunking in the parallel region | |
| 1445 // iteration, a "continues humongous" region might be visited | |
| 1446 // before its associated "starts humongous". | |
| 639 | 1447 return false; |
| 1448 } | |
| 342 | 1449 |
|
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1450 HeapWord* ntams = hr->next_top_at_mark_start(); |
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1451 HeapWord* start = hr->bottom(); |
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1452 |
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1453 assert(start <= hr->end() && start <= ntams && ntams <= hr->end(), |
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1454 err_msg("Preconditions not met - " |
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1455 "start: "PTR_FORMAT", ntams: "PTR_FORMAT", end: "PTR_FORMAT, |
|
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1456 p2i(start), p2i(ntams), p2i(hr->end()))); |
|
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1457 |
| 342 | 1458 // Find the first marked object at or after "start". |
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1459 start = _bm->getNextMarkedWordAddress(start, ntams); |
|
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1460 |
| 342 | 1461 size_t marked_bytes = 0; |
| 1462 | |
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1463 while (start < ntams) { |
| 342 | 1464 oop obj = oop(start); |
| 1465 int obj_sz = obj->size(); | |
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1466 HeapWord* obj_end = start + obj_sz; |
|
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1467 |
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1468 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
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1469 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(obj_end); |
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1470 |
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1471 // Note: if we're looking at the last region in heap - obj_end |
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1472 // could be actually just beyond the end of the heap; end_idx |
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1473 // will then correspond to a (non-existent) card that is also |
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1474 // just beyond the heap. |
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1475 if (_g1h->is_in_g1_reserved(obj_end) && !_ct_bs->is_card_aligned(obj_end)) { |
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1476 // end of object is not card aligned - increment to cover |
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1477 // all the cards spanned by the object |
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1478 end_idx += 1; |
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1479 } |
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1480 |
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1481 // Set the bits in the card BM for the cards spanned by this object. |
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1482 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1483 |
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1484 // Add the size of this object to the number of marked bytes. |
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1485 marked_bytes += (size_t)obj_sz * HeapWordSize; |
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1486 |
| 342 | 1487 // Find the next marked object after this one. |
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1488 start = _bm->getNextMarkedWordAddress(obj_end, ntams); |
|
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1489 } |
|
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1490 |
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1491 // Mark the allocated-since-marking portion... |
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1492 HeapWord* top = hr->top(); |
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1493 if (ntams < top) { |
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1494 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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1495 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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1496 |
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1497 // Note: if we're looking at the last region in heap - top |
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1498 // could be actually just beyond the end of the heap; end_idx |
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1499 // will then correspond to a (non-existent) card that is also |
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1500 // just beyond the heap. |
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1501 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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1502 // end of object is not card aligned - increment to cover |
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1503 // all the cards spanned by the object |
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1504 end_idx += 1; |
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1505 } |
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1506 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
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1507 |
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1508 // This definitely means the region has live objects. |
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1509 set_bit_for_region(hr); |
| 342 | 1510 } |
| 1511 | |
| 1512 // Update the live region bitmap. | |
| 1513 if (marked_bytes > 0) { | |
| 829 | 1514 set_bit_for_region(hr); |
| 342 | 1515 } |
|
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1516 |
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1517 // Set the marked bytes for the current region so that |
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1518 // it can be queried by a calling verificiation routine |
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1519 _region_marked_bytes = marked_bytes; |
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1520 |
| 342 | 1521 return false; |
| 1522 } | |
| 1523 | |
|
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1524 size_t region_marked_bytes() const { return _region_marked_bytes; } |
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1525 }; |
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1526 |
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1527 // Heap region closure used for verifying the counting data |
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1528 // that was accumulated concurrently and aggregated during |
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1529 // the remark pause. This closure is applied to the heap |
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1530 // regions during the STW cleanup pause. |
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1531 |
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1532 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
|
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1533 G1CollectedHeap* _g1h; |
|
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1534 ConcurrentMark* _cm; |
|
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1535 CalcLiveObjectsClosure _calc_cl; |
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1536 BitMap* _region_bm; // Region BM to be verified |
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1537 BitMap* _card_bm; // Card BM to be verified |
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1538 bool _verbose; // verbose output? |
|
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1539 |
|
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1540 BitMap* _exp_region_bm; // Expected Region BM values |
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1541 BitMap* _exp_card_bm; // Expected card BM values |
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1542 |
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1543 int _failures; |
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1544 |
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1545 public: |
|
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1546 VerifyLiveObjectDataHRClosure(G1CollectedHeap* g1h, |
|
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1547 BitMap* region_bm, |
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1548 BitMap* card_bm, |
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1549 BitMap* exp_region_bm, |
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1550 BitMap* exp_card_bm, |
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1551 bool verbose) : |
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1552 _g1h(g1h), _cm(g1h->concurrent_mark()), |
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1553 _calc_cl(_cm->nextMarkBitMap(), g1h, exp_region_bm, exp_card_bm), |
|
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1554 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
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1555 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
|
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1556 _failures(0) { } |
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1557 |
|
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1558 int failures() const { return _failures; } |
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1559 |
|
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1560 bool doHeapRegion(HeapRegion* hr) { |
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1561 if (hr->continuesHumongous()) { |
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1562 // We will ignore these here and process them when their |
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1563 // associated "starts humongous" region is processed (see |
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1564 // set_bit_for_heap_region()). Note that we cannot rely on their |
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1565 // associated "starts humongous" region to have their bit set to |
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1566 // 1 since, due to the region chunking in the parallel region |
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1567 // iteration, a "continues humongous" region might be visited |
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1568 // before its associated "starts humongous". |
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1569 return false; |
|
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1570 } |
|
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|
1571 |
|
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1572 int failures = 0; |
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|
1573 |
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1574 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
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1575 // this region and set the corresponding bits in the expected region |
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1576 // and card bitmaps. |
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|
1577 bool res = _calc_cl.doHeapRegion(hr); |
|
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|
1578 assert(res == false, "should be continuing"); |
|
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|
1579 |
|
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|
1580 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
|
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|
1581 Mutex::_no_safepoint_check_flag); |
|
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|
1582 |
|
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|
1583 // Verify the marked bytes for this region. |
|
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|
1584 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
|
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|
1585 size_t act_marked_bytes = hr->next_marked_bytes(); |
|
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|
1586 |
|
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|
1587 // We're not OK if expected marked bytes > actual marked bytes. It means |
|
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|
1588 // we have missed accounting some objects during the actual marking. |
|
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|
1589 if (exp_marked_bytes > act_marked_bytes) { |
|
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|
1590 if (_verbose) { |
|
6010
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|
1591 gclog_or_tty->print_cr("Region %u: marked bytes mismatch: " |
|
4836
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|
1592 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
|
20377
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|
1593 hr->hrm_index(), exp_marked_bytes, act_marked_bytes); |
|
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|
1594 } |
|
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|
1595 failures += 1; |
|
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|
1596 } |
|
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|
1597 |
|
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|
1598 // Verify the bit, for this region, in the actual and expected |
|
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|
1599 // (which was just calculated) region bit maps. |
|
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1600 // We're not OK if the bit in the calculated expected region |
|
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1601 // bitmap is set and the bit in the actual region bitmap is not. |
|
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|
1602 BitMap::idx_t index = (BitMap::idx_t) hr->hrm_index(); |
|
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1603 |
|
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|
1604 bool expected = _exp_region_bm->at(index); |
|
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1605 bool actual = _region_bm->at(index); |
|
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1606 if (expected && !actual) { |
|
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|
1607 if (_verbose) { |
|
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1608 gclog_or_tty->print_cr("Region %u: region bitmap mismatch: " |
|
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|
1609 "expected: %s, actual: %s", |
|
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|
1610 hr->hrm_index(), |
|
6010
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|
1611 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
|
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|
1612 } |
|
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|
1613 failures += 1; |
|
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|
1614 } |
|
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|
1615 |
|
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|
1616 // Verify that the card bit maps for the cards spanned by the current |
|
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|
1617 // region match. We have an error if we have a set bit in the expected |
|
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|
1618 // bit map and the corresponding bit in the actual bitmap is not set. |
|
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|
1619 |
|
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|
1620 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
|
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|
1621 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
|
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|
1622 |
|
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|
1623 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
|
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|
1624 expected = _exp_card_bm->at(i); |
|
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|
1625 actual = _card_bm->at(i); |
|
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|
1626 |
|
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|
1627 if (expected && !actual) { |
|
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|
1628 if (_verbose) { |
|
6010
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|
1629 gclog_or_tty->print_cr("Region %u: card bitmap mismatch at " SIZE_FORMAT ": " |
|
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changeset
|
1630 "expected: %s, actual: %s", |
|
20377
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8054819: Rename HeapRegionSeq to HeapRegionManager
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changeset
|
1631 hr->hrm_index(), i, |
|
6010
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changeset
|
1632 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
|
4836
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|
1633 } |
|
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changeset
|
1634 failures += 1; |
|
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changeset
|
1635 } |
|
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changeset
|
1636 } |
|
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|
1637 |
|
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changeset
|
1638 if (failures > 0 && _verbose) { |
|
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|
1639 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
|
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|
1640 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
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diff
changeset
|
1641 HR_FORMAT_PARAMS(hr), p2i(hr->next_top_at_mark_start()), |
|
4836
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|
1642 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
|
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|
1643 } |
|
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|
1644 |
|
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|
1645 _failures += failures; |
|
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changeset
|
1646 |
|
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changeset
|
1647 // We could stop iteration over the heap when we |
|
6027
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
johnc
parents:
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diff
changeset
|
1648 // find the first violating region by returning true. |
|
4836
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|
1649 return false; |
|
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|
1650 } |
| 342 | 1651 }; |
| 1652 | |
|
4836
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|
1653 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
|
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|
1654 protected: |
|
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|
1655 G1CollectedHeap* _g1h; |
|
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|
1656 ConcurrentMark* _cm; |
|
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|
1657 BitMap* _actual_region_bm; |
|
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|
1658 BitMap* _actual_card_bm; |
|
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|
1659 |
|
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|
1660 uint _n_workers; |
|
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changeset
|
1661 |
|
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changeset
|
1662 BitMap* _expected_region_bm; |
|
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|
1663 BitMap* _expected_card_bm; |
|
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changeset
|
1664 |
|
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diff
changeset
|
1665 int _failures; |
|
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diff
changeset
|
1666 bool _verbose; |
|
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changeset
|
1667 |
|
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diff
changeset
|
1668 public: |
|
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changeset
|
1669 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
|
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changeset
|
1670 BitMap* region_bm, BitMap* card_bm, |
|
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changeset
|
1671 BitMap* expected_region_bm, BitMap* expected_card_bm) |
|
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|
1672 : AbstractGangTask("G1 verify final counting"), |
|
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changeset
|
1673 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
|
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changeset
|
1674 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
|
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changeset
|
1675 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
|
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|
1676 _failures(0), _verbose(false), |
|
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diff
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|
1677 _n_workers(0) { |
|
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changeset
|
1678 assert(VerifyDuringGC, "don't call this otherwise"); |
|
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diff
changeset
|
1679 |
|
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diff
changeset
|
1680 // Use the value already set as the number of active threads |
|
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diff
changeset
|
1681 // in the call to run_task(). |
|
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diff
changeset
|
1682 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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diff
changeset
|
1683 assert( _g1h->workers()->active_workers() > 0, |
|
d30fa85f9994
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diff
changeset
|
1684 "Should have been previously set"); |
|
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diff
changeset
|
1685 _n_workers = _g1h->workers()->active_workers(); |
|
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diff
changeset
|
1686 } else { |
|
d30fa85f9994
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diff
changeset
|
1687 _n_workers = 1; |
|
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diff
changeset
|
1688 } |
|
d30fa85f9994
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diff
changeset
|
1689 |
|
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diff
changeset
|
1690 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
|
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changeset
|
1691 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
|
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changeset
|
1692 |
|
d30fa85f9994
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diff
changeset
|
1693 _verbose = _cm->verbose_medium(); |
|
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diff
changeset
|
1694 } |
|
d30fa85f9994
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diff
changeset
|
1695 |
|
d30fa85f9994
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diff
changeset
|
1696 void work(uint worker_id) { |
|
d30fa85f9994
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diff
changeset
|
1697 assert(worker_id < _n_workers, "invariant"); |
|
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|
1698 |
|
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|
1699 VerifyLiveObjectDataHRClosure verify_cl(_g1h, |
|
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|
1700 _actual_region_bm, _actual_card_bm, |
|
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|
1701 _expected_region_bm, |
|
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|
1702 _expected_card_bm, |
|
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|
1703 _verbose); |
|
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|
1704 |
|
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|
1705 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
1706 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
|
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|
1707 worker_id, |
|
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|
1708 _n_workers, |
|
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|
1709 HeapRegion::VerifyCountClaimValue); |
|
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|
1710 } else { |
|
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|
1711 _g1h->heap_region_iterate(&verify_cl); |
|
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|
1712 } |
|
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|
1713 |
|
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|
1714 Atomic::add(verify_cl.failures(), &_failures); |
|
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|
1715 } |
|
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|
1716 |
|
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|
1717 int failures() const { return _failures; } |
|
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|
1718 }; |
|
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|
1719 |
|
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|
1720 // Closure that finalizes the liveness counting data. |
|
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|
1721 // Used during the cleanup pause. |
|
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|
1722 // Sets the bits corresponding to the interval [NTAMS, top] |
|
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|
1723 // (which contains the implicitly live objects) in the |
|
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|
1724 // card liveness bitmap. Also sets the bit for each region, |
|
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|
1725 // containing live data, in the region liveness bitmap. |
|
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|
1726 |
|
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|
1727 class FinalCountDataUpdateClosure: public CMCountDataClosureBase { |
|
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|
1728 public: |
|
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|
1729 FinalCountDataUpdateClosure(G1CollectedHeap* g1h, |
|
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|
1730 BitMap* region_bm, |
|
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|
1731 BitMap* card_bm) : |
|
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1732 CMCountDataClosureBase(g1h, region_bm, card_bm) { } |
|
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|
1733 |
|
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|
1734 bool doHeapRegion(HeapRegion* hr) { |
|
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|
1735 |
|
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|
1736 if (hr->continuesHumongous()) { |
|
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|
1737 // We will ignore these here and process them when their |
|
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1738 // associated "starts humongous" region is processed (see |
|
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1739 // set_bit_for_heap_region()). Note that we cannot rely on their |
|
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|
1740 // associated "starts humongous" region to have their bit set to |
|
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|
1741 // 1 since, due to the region chunking in the parallel region |
|
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|
1742 // iteration, a "continues humongous" region might be visited |
|
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|
1743 // before its associated "starts humongous". |
|
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|
1744 return false; |
|
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|
1745 } |
|
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|
1746 |
|
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|
1747 HeapWord* ntams = hr->next_top_at_mark_start(); |
|
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|
1748 HeapWord* top = hr->top(); |
|
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|
1749 |
|
6027
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|
1750 assert(hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
|
4836
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|
1751 |
|
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|
1752 // Mark the allocated-since-marking portion... |
|
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|
1753 if (ntams < top) { |
|
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|
1754 // This definitely means the region has live objects. |
|
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|
1755 set_bit_for_region(hr); |
|
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|
1756 |
|
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changeset
|
1757 // Now set the bits in the card bitmap for [ntams, top) |
|
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|
1758 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
|
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|
1759 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
|
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changeset
|
1760 |
|
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changeset
|
1761 // Note: if we're looking at the last region in heap - top |
|
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changeset
|
1762 // could be actually just beyond the end of the heap; end_idx |
|
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|
1763 // will then correspond to a (non-existent) card that is also |
|
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|
1764 // just beyond the heap. |
|
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changeset
|
1765 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
|
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changeset
|
1766 // end of object is not card aligned - increment to cover |
|
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|
1767 // all the cards spanned by the object |
|
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|
1768 end_idx += 1; |
|
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|
1769 } |
|
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changeset
|
1770 |
|
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changeset
|
1771 assert(end_idx <= _card_bm->size(), |
|
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changeset
|
1772 err_msg("oob: end_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
|
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changeset
|
1773 end_idx, _card_bm->size())); |
|
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changeset
|
1774 assert(start_idx < _card_bm->size(), |
|
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|
1775 err_msg("oob: start_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
|
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changeset
|
1776 start_idx, _card_bm->size())); |
|
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changeset
|
1777 |
|
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changeset
|
1778 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
|
6725
da91efe96a93
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diff
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|
1779 } |
|
4836
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|
1780 |
|
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|
1781 // Set the bit for the region if it contains live data |
|
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|
1782 if (hr->next_marked_bytes() > 0) { |
|
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|
1783 set_bit_for_region(hr); |
|
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|
1784 } |
|
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diff
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|
1785 |
|
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|
1786 return false; |
|
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diff
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|
1787 } |
|
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|
1788 }; |
| 342 | 1789 |
| 1790 class G1ParFinalCountTask: public AbstractGangTask { | |
| 1791 protected: | |
| 1792 G1CollectedHeap* _g1h; | |
|
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|
1793 ConcurrentMark* _cm; |
|
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|
1794 BitMap* _actual_region_bm; |
|
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|
1795 BitMap* _actual_card_bm; |
|
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|
1796 |
|
4728
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|
1797 uint _n_workers; |
|
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|
1798 |
| 342 | 1799 public: |
|
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|
1800 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
|
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|
1801 : AbstractGangTask("G1 final counting"), |
|
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|
1802 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
|
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|
1803 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
|
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|
1804 _n_workers(0) { |
|
4095
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|
1805 // Use the value already set as the number of active threads |
| 6011 | 1806 // in the call to run_task(). |
|
4095
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|
1807 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
bca17e38de00
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|
1808 assert( _g1h->workers()->active_workers() > 0, |
|
bca17e38de00
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|
1809 "Should have been previously set"); |
|
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|
1810 _n_workers = _g1h->workers()->active_workers(); |
|
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|
1811 } else { |
| 342 | 1812 _n_workers = 1; |
|
3776
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|
1813 } |
| 342 | 1814 } |
| 1815 | |
|
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|
1816 void work(uint worker_id) { |
|
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|
1817 assert(worker_id < _n_workers, "invariant"); |
|
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|
1818 |
|
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|
1819 FinalCountDataUpdateClosure final_update_cl(_g1h, |
|
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|
1820 _actual_region_bm, |
|
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|
1821 _actual_card_bm); |
|
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|
1822 |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
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1719
diff
changeset
|
1823 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4836
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|
1824 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
|
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1825 worker_id, |
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1826 _n_workers, |
| 355 | 1827 HeapRegion::FinalCountClaimValue); |
| 342 | 1828 } else { |
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1829 _g1h->heap_region_iterate(&final_update_cl); |
| 342 | 1830 } |
| 1831 } | |
| 1832 }; | |
| 1833 | |
| 1834 class G1ParNoteEndTask; | |
| 1835 | |
| 1836 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
| 1837 G1CollectedHeap* _g1; | |
| 1838 size_t _max_live_bytes; | |
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1839 uint _regions_claimed; |
| 342 | 1840 size_t _freed_bytes; |
| 2173 | 1841 FreeRegionList* _local_cleanup_list; |
|
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1842 HeapRegionSetCount _old_regions_removed; |
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1843 HeapRegionSetCount _humongous_regions_removed; |
| 2173 | 1844 HRRSCleanupTask* _hrrs_cleanup_task; |
| 342 | 1845 double _claimed_region_time; |
| 1846 double _max_region_time; | |
| 1847 | |
| 1848 public: | |
| 1849 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
| 2173 | 1850 FreeRegionList* local_cleanup_list, |
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1851 HRRSCleanupTask* hrrs_cleanup_task) : |
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1852 _g1(g1), |
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1853 _max_live_bytes(0), _regions_claimed(0), |
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1854 _freed_bytes(0), |
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1855 _claimed_region_time(0.0), _max_region_time(0.0), |
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1856 _local_cleanup_list(local_cleanup_list), |
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1857 _old_regions_removed(), |
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1858 _humongous_regions_removed(), |
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1859 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
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1860 |
| 342 | 1861 size_t freed_bytes() { return _freed_bytes; } |
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1862 const HeapRegionSetCount& old_regions_removed() { return _old_regions_removed; } |
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1863 const HeapRegionSetCount& humongous_regions_removed() { return _humongous_regions_removed; } |
| 342 | 1864 |
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1865 bool doHeapRegion(HeapRegion *hr) { |
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1866 if (hr->continuesHumongous()) { |
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1867 return false; |
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1868 } |
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1869 // We use a claim value of zero here because all regions |
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1870 // were claimed with value 1 in the FinalCount task. |
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1871 _g1->reset_gc_time_stamps(hr); |
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1872 double start = os::elapsedTime(); |
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1873 _regions_claimed++; |
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1874 hr->note_end_of_marking(); |
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1875 _max_live_bytes += hr->max_live_bytes(); |
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1876 |
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1877 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { |
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1878 _freed_bytes += hr->used(); |
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1879 hr->set_containing_set(NULL); |
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1880 if (hr->isHumongous()) { |
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1881 assert(hr->startsHumongous(), "we should only see starts humongous"); |
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1882 _humongous_regions_removed.increment(1u, hr->capacity()); |
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1883 _g1->free_humongous_region(hr, _local_cleanup_list, true); |
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1884 } else { |
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1885 _old_regions_removed.increment(1u, hr->capacity()); |
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1886 _g1->free_region(hr, _local_cleanup_list, true); |
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1887 } |
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1888 } else { |
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1889 hr->rem_set()->do_cleanup_work(_hrrs_cleanup_task); |
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1890 } |
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1891 |
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1892 double region_time = (os::elapsedTime() - start); |
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1893 _claimed_region_time += region_time; |
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1894 if (region_time > _max_region_time) { |
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1895 _max_region_time = region_time; |
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1896 } |
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1897 return false; |
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1898 } |
| 342 | 1899 |
| 1900 size_t max_live_bytes() { return _max_live_bytes; } | |
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1901 uint regions_claimed() { return _regions_claimed; } |
| 342 | 1902 double claimed_region_time_sec() { return _claimed_region_time; } |
| 1903 double max_region_time_sec() { return _max_region_time; } | |
| 1904 }; | |
| 1905 | |
| 1906 class G1ParNoteEndTask: public AbstractGangTask { | |
| 1907 friend class G1NoteEndOfConcMarkClosure; | |
| 2152 | 1908 |
| 342 | 1909 protected: |
| 1910 G1CollectedHeap* _g1h; | |
| 1911 size_t _max_live_bytes; | |
| 1912 size_t _freed_bytes; | |
| 2152 | 1913 FreeRegionList* _cleanup_list; |
| 1914 | |
| 342 | 1915 public: |
| 1916 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
| 2152 | 1917 FreeRegionList* cleanup_list) : |
| 342 | 1918 AbstractGangTask("G1 note end"), _g1h(g1h), |
| 2152 | 1919 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
| 342 | 1920 |
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1921 void work(uint worker_id) { |
| 342 | 1922 double start = os::elapsedTime(); |
| 2173 | 1923 FreeRegionList local_cleanup_list("Local Cleanup List"); |
| 1924 HRRSCleanupTask hrrs_cleanup_task; | |
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1925 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, &local_cleanup_list, |
| 2173 | 1926 &hrrs_cleanup_task); |
|
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1927 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1928 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
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1929 _g1h->workers()->active_workers(), |
| 355 | 1930 HeapRegion::NoteEndClaimValue); |
| 342 | 1931 } else { |
| 1932 _g1h->heap_region_iterate(&g1_note_end); | |
| 1933 } | |
| 1934 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
| 1935 | |
| 2152 | 1936 // Now update the lists |
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1937 _g1h->remove_from_old_sets(g1_note_end.old_regions_removed(), g1_note_end.humongous_regions_removed()); |
| 342 | 1938 { |
| 1939 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
|
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1940 _g1h->decrement_summary_bytes(g1_note_end.freed_bytes()); |
| 342 | 1941 _max_live_bytes += g1_note_end.max_live_bytes(); |
| 1942 _freed_bytes += g1_note_end.freed_bytes(); | |
| 2152 | 1943 |
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1944 // If we iterate over the global cleanup list at the end of |
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1945 // cleanup to do this printing we will not guarantee to only |
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1946 // generate output for the newly-reclaimed regions (the list |
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1947 // might not be empty at the beginning of cleanup; we might |
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1948 // still be working on its previous contents). So we do the |
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1949 // printing here, before we append the new regions to the global |
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1950 // cleanup list. |
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1951 |
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1952 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
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1953 if (hr_printer->is_active()) { |
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1954 FreeRegionListIterator iter(&local_cleanup_list); |
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1955 while (iter.more_available()) { |
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1956 HeapRegion* hr = iter.get_next(); |
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1957 hr_printer->cleanup(hr); |
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1958 } |
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1959 } |
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1960 |
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1961 _cleanup_list->add_ordered(&local_cleanup_list); |
| 2173 | 1962 assert(local_cleanup_list.is_empty(), "post-condition"); |
| 1963 | |
| 1964 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
| 342 | 1965 } |
| 1966 } | |
| 1967 size_t max_live_bytes() { return _max_live_bytes; } | |
| 1968 size_t freed_bytes() { return _freed_bytes; } | |
| 1969 }; | |
| 1970 | |
| 1971 class G1ParScrubRemSetTask: public AbstractGangTask { | |
| 1972 protected: | |
| 1973 G1RemSet* _g1rs; | |
| 1974 BitMap* _region_bm; | |
| 1975 BitMap* _card_bm; | |
| 1976 public: | |
| 1977 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
| 1978 BitMap* region_bm, BitMap* card_bm) : | |
| 1979 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
|
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1980 _region_bm(region_bm), _card_bm(card_bm) { } |
| 342 | 1981 |
|
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1982 void work(uint worker_id) { |
|
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1983 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1984 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
| 355 | 1985 HeapRegion::ScrubRemSetClaimValue); |
| 342 | 1986 } else { |
| 1987 _g1rs->scrub(_region_bm, _card_bm); | |
| 1988 } | |
| 1989 } | |
| 1990 | |
| 1991 }; | |
| 1992 | |
| 1993 void ConcurrentMark::cleanup() { | |
| 1994 // world is stopped at this checkpoint | |
| 1995 assert(SafepointSynchronize::is_at_safepoint(), | |
| 1996 "world should be stopped"); | |
| 1997 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1998 | |
| 1999 // If a full collection has happened, we shouldn't do this. | |
| 2000 if (has_aborted()) { | |
| 2001 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 2002 return; | |
| 2003 } | |
| 2004 | |
| 2152 | 2005 g1h->verify_region_sets_optional(); |
| 2006 | |
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2007 if (VerifyDuringGC) { |
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2008 HandleMark hm; // handle scope |
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2009 Universe::heap()->prepare_for_verify(); |
|
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2010 Universe::verify(VerifyOption_G1UsePrevMarking, |
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2011 " VerifyDuringGC:(before)"); |
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2012 } |
|
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2013 g1h->check_bitmaps("Cleanup Start"); |
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2014 |
| 342 | 2015 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
| 2016 g1p->record_concurrent_mark_cleanup_start(); | |
| 2017 | |
| 2018 double start = os::elapsedTime(); | |
| 2019 | |
| 2173 | 2020 HeapRegionRemSet::reset_for_cleanup_tasks(); |
| 2021 | |
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2022 uint n_workers; |
|
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2023 |
| 342 | 2024 // Do counting once more with the world stopped for good measure. |
|
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|
2025 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
|
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|
2026 |
|
1833
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|
2027 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4836
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|
2028 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
| 355 | 2029 "sanity check"); |
| 2030 | |
| 4711 | 2031 g1h->set_par_threads(); |
| 2032 n_workers = g1h->n_par_threads(); | |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
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parents:
4711
diff
changeset
|
2033 assert(g1h->n_par_threads() == n_workers, |
| 4711 | 2034 "Should not have been reset"); |
| 342 | 2035 g1h->workers()->run_task(&g1_par_count_task); |
|
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|
2036 // Done with the parallel phase so reset to 0. |
| 342 | 2037 g1h->set_par_threads(0); |
| 355 | 2038 |
|
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|
2039 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
| 355 | 2040 "sanity check"); |
| 342 | 2041 } else { |
| 4711 | 2042 n_workers = 1; |
| 342 | 2043 g1_par_count_task.work(0); |
| 2044 } | |
| 2045 | |
|
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|
2046 if (VerifyDuringGC) { |
|
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|
2047 // Verify that the counting data accumulated during marking matches |
|
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|
2048 // that calculated by walking the marking bitmap. |
|
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|
2049 |
|
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|
2050 // Bitmaps to hold expected values |
|
20263
4dfab3faf5e7
8037958: ConcurrentMark::cleanup leaks BitMaps if VerifyDuringGC is enabled
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changeset
|
2051 BitMap expected_region_bm(_region_bm.size(), true); |
|
4dfab3faf5e7
8037958: ConcurrentMark::cleanup leaks BitMaps if VerifyDuringGC is enabled
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|
2052 BitMap expected_card_bm(_card_bm.size(), true); |
|
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|
2053 |
|
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|
2054 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
|
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|
2055 &_region_bm, |
|
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|
2056 &_card_bm, |
|
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|
2057 &expected_region_bm, |
|
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|
2058 &expected_card_bm); |
|
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|
2059 |
|
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|
2060 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
2061 g1h->set_par_threads((int)n_workers); |
|
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|
2062 g1h->workers()->run_task(&g1_par_verify_task); |
|
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|
2063 // Done with the parallel phase so reset to 0. |
|
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|
2064 g1h->set_par_threads(0); |
|
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|
2065 |
|
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|
2066 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
|
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|
2067 "sanity check"); |
|
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|
2068 } else { |
|
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|
2069 g1_par_verify_task.work(0); |
|
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|
2070 } |
|
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|
2071 |
|
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|
2072 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
|
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|
2073 } |
|
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|
2074 |
| 342 | 2075 size_t start_used_bytes = g1h->used(); |
| 2076 g1h->set_marking_complete(); | |
| 2077 | |
| 2078 double count_end = os::elapsedTime(); | |
| 2079 double this_final_counting_time = (count_end - start); | |
| 2080 _total_counting_time += this_final_counting_time; | |
| 2081 | |
|
2435
371bbc844bf1
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|
2082 if (G1PrintRegionLivenessInfo) { |
|
371bbc844bf1
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2369
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|
2083 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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|
2084 _g1h->heap_region_iterate(&cl); |
|
371bbc844bf1
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diff
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|
2085 } |
|
371bbc844bf1
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diff
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|
2086 |
| 342 | 2087 // Install newly created mark bitMap as "prev". |
| 2088 swapMarkBitMaps(); | |
| 2089 | |
| 2090 g1h->reset_gc_time_stamp(); | |
| 2091 | |
| 2092 // Note end of marking in all heap regions. | |
| 2152 | 2093 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
|
1833
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diff
changeset
|
2094 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4095
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|
2095 g1h->set_par_threads((int)n_workers); |
| 342 | 2096 g1h->workers()->run_task(&g1_par_note_end_task); |
| 2097 g1h->set_par_threads(0); | |
| 355 | 2098 |
| 2099 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
| 2100 "sanity check"); | |
| 342 | 2101 } else { |
| 2102 g1_par_note_end_task.work(0); | |
| 2103 } | |
|
6254
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
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6220
diff
changeset
|
2104 g1h->check_gc_time_stamps(); |
| 2152 | 2105 |
| 2106 if (!cleanup_list_is_empty()) { | |
| 2107 // The cleanup list is not empty, so we'll have to process it | |
| 2108 // concurrently. Notify anyone else that might be wanting free | |
| 2109 // regions that there will be more free regions coming soon. | |
| 2110 g1h->set_free_regions_coming(); | |
| 2111 } | |
| 342 | 2112 |
| 2113 // call below, since it affects the metric by which we sort the heap | |
| 2114 // regions. | |
| 2115 if (G1ScrubRemSets) { | |
| 2116 double rs_scrub_start = os::elapsedTime(); | |
| 2117 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
|
1833
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|
2118 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
2119 g1h->set_par_threads((int)n_workers); |
| 342 | 2120 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
| 2121 g1h->set_par_threads(0); | |
| 355 | 2122 |
| 2123 assert(g1h->check_heap_region_claim_values( | |
| 2124 HeapRegion::ScrubRemSetClaimValue), | |
| 2125 "sanity check"); | |
| 342 | 2126 } else { |
| 2127 g1_par_scrub_rs_task.work(0); | |
| 2128 } | |
| 2129 | |
| 2130 double rs_scrub_end = os::elapsedTime(); | |
| 2131 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
| 2132 _total_rs_scrub_time += this_rs_scrub_time; | |
| 2133 } | |
| 2134 | |
| 2135 // this will also free any regions totally full of garbage objects, | |
| 2136 // and sort the regions. | |
|
4095
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|
2137 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
| 342 | 2138 |
| 2139 // Statistics. | |
| 2140 double end = os::elapsedTime(); | |
| 2141 _cleanup_times.add((end - start) * 1000.0); | |
| 2142 | |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5988
diff
changeset
|
2143 if (G1Log::fine()) { |
| 342 | 2144 g1h->print_size_transition(gclog_or_tty, |
| 2145 start_used_bytes, | |
| 2146 g1h->used(), | |
| 2147 g1h->capacity()); | |
| 2148 } | |
| 2149 | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2150 // Clean up will have freed any regions completely full of garbage. |
|
4dfb2df418f2
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johnc
parents:
3977
diff
changeset
|
2151 // Update the soft reference policy with the new heap occupancy. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2152 Universe::update_heap_info_at_gc(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3977
diff
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|
2153 |
| 751 | 2154 if (VerifyDuringGC) { |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2155 HandleMark hm; // handle scope |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2156 Universe::heap()->prepare_for_verify(); |
|
10186
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
9076
diff
changeset
|
2157 Universe::verify(VerifyOption_G1UsePrevMarking, |
|
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
9076
diff
changeset
|
2158 " VerifyDuringGC:(after)"); |
| 342 | 2159 } |
|
20291
e0954897238a
7132678: G1: verify that the marking bitmaps have no marks for objects over TAMS
brutisso
parents:
20282
diff
changeset
|
2160 g1h->check_bitmaps("Cleanup End"); |
| 2152 | 2161 |
| 2162 g1h->verify_region_sets_optional(); | |
|
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2163 |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2164 // We need to make this be a "collection" so any collection pause that |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2165 // races with it goes around and waits for completeCleanup to finish. |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2166 g1h->increment_total_collections(); |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2167 |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2168 // Clean out dead classes and update Metaspace sizes. |
|
20282
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2169 if (ClassUnloadingWithConcurrentMark) { |
|
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2170 ClassLoaderDataGraph::purge(); |
|
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2171 } |
|
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2172 MetaspaceGC::compute_new_size(); |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
changeset
|
2173 |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2174 // We reclaimed old regions so we should calculate the sizes to make |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
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diff
changeset
|
2175 // sure we update the old gen/space data. |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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diff
changeset
|
2176 g1h->g1mm()->update_sizes(); |
|
2c6ef90f030a
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20263
diff
changeset
|
2177 |
| 10405 | 2178 g1h->trace_heap_after_concurrent_cycle(); |
| 342 | 2179 } |
| 2180 | |
| 2181 void ConcurrentMark::completeCleanup() { | |
| 2182 if (has_aborted()) return; | |
| 2183 | |
| 2152 | 2184 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 2185 | |
|
17841
14bd75c9dbfa
8039089: List verification enabled in product builds
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17773
diff
changeset
|
2186 _cleanup_list.verify_optional(); |
| 2361 | 2187 FreeRegionList tmp_free_list("Tmp Free List"); |
| 2152 | 2188 |
| 2189 if (G1ConcRegionFreeingVerbose) { | |
| 2190 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
2191 "cleanup list has %u entries", |
| 2152 | 2192 _cleanup_list.length()); |
| 2193 } | |
| 2194 | |
| 20337 | 2195 // No one else should be accessing the _cleanup_list at this point, |
| 2196 // so it is not necessary to take any locks | |
| 2152 | 2197 while (!_cleanup_list.is_empty()) { |
|
20336
6701abbc4441
8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents:
20335
diff
changeset
|
2198 HeapRegion* hr = _cleanup_list.remove_region(true /* from_head */); |
|
17773
8ee855b4e667
8036025: Sort the freelist in order to shrink the heap
jwilhelm
parents:
17750
diff
changeset
|
2199 assert(hr != NULL, "Got NULL from a non-empty list"); |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
3316
diff
changeset
|
2200 hr->par_clear(); |
|
17773
8ee855b4e667
8036025: Sort the freelist in order to shrink the heap
jwilhelm
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17750
diff
changeset
|
2201 tmp_free_list.add_ordered(hr); |
| 2152 | 2202 |
| 2203 // Instead of adding one region at a time to the secondary_free_list, | |
| 2204 // we accumulate them in the local list and move them a few at a | |
| 2205 // time. This also cuts down on the number of notify_all() calls | |
| 2206 // we do during this process. We'll also append the local list when | |
| 2207 // _cleanup_list is empty (which means we just removed the last | |
| 2208 // region from the _cleanup_list). | |
| 2361 | 2209 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
| 2152 | 2210 _cleanup_list.is_empty()) { |
| 2211 if (G1ConcRegionFreeingVerbose) { | |
| 2212 gclog_or_tty->print_cr("G1ConcRegionFreeing [complete cleanup] : " | |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
2213 "appending %u entries to the secondary_free_list, " |
|
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
2214 "cleanup list still has %u entries", |
| 2361 | 2215 tmp_free_list.length(), |
| 2152 | 2216 _cleanup_list.length()); |
| 342 | 2217 } |
| 2152 | 2218 |
| 2219 { | |
| 2220 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
|
17773
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8036025: Sort the freelist in order to shrink the heap
jwilhelm
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17750
diff
changeset
|
2221 g1h->secondary_free_list_add(&tmp_free_list); |
| 2152 | 2222 SecondaryFreeList_lock->notify_all(); |
| 2223 } | |
| 2224 | |
| 2225 if (G1StressConcRegionFreeing) { | |
| 2226 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
| 2227 os::sleep(Thread::current(), (jlong) 1, false); | |
| 2228 } | |
| 2229 } | |
| 342 | 2230 } |
| 2231 } | |
| 2361 | 2232 assert(tmp_free_list.is_empty(), "post-condition"); |
| 342 | 2233 } |
| 2234 | |
|
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2235 // Supporting Object and Oop closures for reference discovery |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2236 // and processing in during marking |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2237 |
|
2037
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|
2238 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
|
b03260081e9b
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|
2239 HeapWord* addr = (HeapWord*)obj; |
|
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diff
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|
2240 return addr != NULL && |
|
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|
2241 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
|
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|
2242 } |
| 342 | 2243 |
|
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|
2244 // 'Keep Alive' oop closure used by both serial parallel reference processing. |
|
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|
2245 // Uses the CMTask associated with a worker thread (for serial reference |
|
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|
2246 // processing the CMTask for worker 0 is used) to preserve (mark) and |
|
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|
2247 // trace referent objects. |
|
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|
2248 // |
|
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|
2249 // Using the CMTask and embedded local queues avoids having the worker |
|
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|
2250 // threads operating on the global mark stack. This reduces the risk |
|
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|
2251 // of overflowing the stack - which we would rather avoid at this late |
|
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|
2252 // state. Also using the tasks' local queues removes the potential |
|
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|
2253 // of the workers interfering with each other that could occur if |
|
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|
2254 // operating on the global stack. |
|
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|
2255 |
|
f90b9bceb8e5
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|
2256 class G1CMKeepAliveAndDrainClosure: public OopClosure { |
|
8787
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|
2257 ConcurrentMark* _cm; |
|
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|
2258 CMTask* _task; |
|
fa08949fe0cb
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|
2259 int _ref_counter_limit; |
|
fa08949fe0cb
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|
2260 int _ref_counter; |
|
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|
2261 bool _is_serial; |
|
2174
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|
2262 public: |
|
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|
2263 G1CMKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
|
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|
2264 _cm(cm), _task(task), _is_serial(is_serial), |
|
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|
2265 _ref_counter_limit(G1RefProcDrainInterval) { |
|
2174
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|
2266 assert(_ref_counter_limit > 0, "sanity"); |
|
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|
2267 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
|
2174
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|
2268 _ref_counter = _ref_counter_limit; |
|
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|
2269 } |
|
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|
2270 |
|
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|
2271 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
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|
2272 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
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|
2273 |
|
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|
2274 template <class T> void do_oop_work(T* p) { |
|
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|
2275 if (!_cm->has_overflown()) { |
|
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|
2276 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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|
2277 if (_cm->verbose_high()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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diff
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|
2278 gclog_or_tty->print_cr("\t[%u] we're looking at location " |
|
2174
234761c55641
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diff
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|
2279 "*"PTR_FORMAT" = "PTR_FORMAT, |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
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diff
changeset
|
2280 _task->worker_id(), p2i(p), p2i((void*) obj)); |
|
3776
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|
2281 } |
|
2174
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|
2282 |
|
234761c55641
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|
2283 _task->deal_with_reference(obj); |
|
234761c55641
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|
2284 _ref_counter--; |
|
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|
2285 |
|
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|
2286 if (_ref_counter == 0) { |
|
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|
2287 // We have dealt with _ref_counter_limit references, pushing them |
|
f90b9bceb8e5
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|
2288 // and objects reachable from them on to the local stack (and |
|
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changeset
|
2289 // possibly the global stack). Call CMTask::do_marking_step() to |
|
f90b9bceb8e5
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changeset
|
2290 // process these entries. |
|
f90b9bceb8e5
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8008
diff
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|
2291 // |
|
f90b9bceb8e5
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8008
diff
changeset
|
2292 // We call CMTask::do_marking_step() in a loop, which we'll exit if |
|
f90b9bceb8e5
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diff
changeset
|
2293 // there's nothing more to do (i.e. we're done with the entries that |
|
f90b9bceb8e5
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8008
diff
changeset
|
2294 // were pushed as a result of the CMTask::deal_with_reference() calls |
|
f90b9bceb8e5
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8008
diff
changeset
|
2295 // above) or we overflow. |
|
f90b9bceb8e5
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parents:
8008
diff
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|
2296 // |
|
f90b9bceb8e5
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8008
diff
changeset
|
2297 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
|
f90b9bceb8e5
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8008
diff
changeset
|
2298 // flag while there may still be some work to do. (See the comment at |
|
f90b9bceb8e5
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parents:
8008
diff
changeset
|
2299 // the beginning of CMTask::do_marking_step() for those conditions - |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2300 // one of which is reaching the specified time target.) It is only |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2301 // when CMTask::do_marking_step() returns without setting the |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2302 // has_aborted() flag that the marking step has completed. |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
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|
2303 do { |
|
234761c55641
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parents:
2152
diff
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|
2304 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
|
234761c55641
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2152
diff
changeset
|
2305 _task->do_marking_step(mark_step_duration_ms, |
|
8787
fa08949fe0cb
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parents:
8744
diff
changeset
|
2306 false /* do_termination */, |
|
fa08949fe0cb
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8744
diff
changeset
|
2307 _is_serial); |
|
2174
234761c55641
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|
2308 } while (_task->has_aborted() && !_cm->has_overflown()); |
|
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|
2309 _ref_counter = _ref_counter_limit; |
|
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|
2310 } |
|
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2152
diff
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|
2311 } else { |
|
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
changeset
|
2312 if (_cm->verbose_high()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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parents:
6812
diff
changeset
|
2313 gclog_or_tty->print_cr("\t[%u] CM Overflow", _task->worker_id()); |
|
3776
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|
2314 } |
|
2174
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|
2315 } |
|
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2152
diff
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|
2316 } |
|
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diff
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|
2317 }; |
|
234761c55641
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2152
diff
changeset
|
2318 |
|
8014
f90b9bceb8e5
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8008
diff
changeset
|
2319 // 'Drain' oop closure used by both serial and parallel reference processing. |
|
f90b9bceb8e5
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8008
diff
changeset
|
2320 // Uses the CMTask associated with a given worker thread (for serial |
|
f90b9bceb8e5
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8008
diff
changeset
|
2321 // reference processing the CMtask for worker 0 is used). Calls the |
|
f90b9bceb8e5
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diff
changeset
|
2322 // do_marking_step routine, with an unbelievably large timeout value, |
|
f90b9bceb8e5
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8008
diff
changeset
|
2323 // to drain the marking data structures of the remaining entries |
|
f90b9bceb8e5
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8008
diff
changeset
|
2324 // added by the 'keep alive' oop closure above. |
|
f90b9bceb8e5
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8008
diff
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|
2325 |
|
f90b9bceb8e5
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8008
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changeset
|
2326 class G1CMDrainMarkingStackClosure: public VoidClosure { |
|
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|
2327 ConcurrentMark* _cm; |
|
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|
2328 CMTask* _task; |
|
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|
2329 bool _is_serial; |
|
2174
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|
2330 public: |
|
8787
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|
2331 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
|
fa08949fe0cb
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|
2332 _cm(cm), _task(task), _is_serial(is_serial) { |
|
fa08949fe0cb
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|
2333 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
|
8014
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|
2334 } |
|
2174
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|
2335 |
|
234761c55641
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|
2336 void do_void() { |
|
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|
2337 do { |
|
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|
2338 if (_cm->verbose_high()) { |
|
8787
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changeset
|
2339 gclog_or_tty->print_cr("\t[%u] Drain: Calling do_marking_step - serial: %s", |
|
fa08949fe0cb
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|
2340 _task->worker_id(), BOOL_TO_STR(_is_serial)); |
|
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|
2341 } |
|
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|
2342 |
|
8014
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changeset
|
2343 // We call CMTask::do_marking_step() to completely drain the local |
|
f90b9bceb8e5
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changeset
|
2344 // and global marking stacks of entries pushed by the 'keep alive' |
|
f90b9bceb8e5
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|
2345 // oop closure (an instance of G1CMKeepAliveAndDrainClosure above). |
|
f90b9bceb8e5
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|
2346 // |
|
f90b9bceb8e5
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8008
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changeset
|
2347 // CMTask::do_marking_step() is called in a loop, which we'll exit |
|
f90b9bceb8e5
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changeset
|
2348 // if there's nothing more to do (i.e. we'completely drained the |
|
f90b9bceb8e5
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diff
changeset
|
2349 // entries that were pushed as a a result of applying the 'keep alive' |
|
f90b9bceb8e5
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diff
changeset
|
2350 // closure to the entries on the discovered ref lists) or we overflow |
|
f90b9bceb8e5
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changeset
|
2351 // the global marking stack. |
|
f90b9bceb8e5
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8008
diff
changeset
|
2352 // |
|
f90b9bceb8e5
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8008
diff
changeset
|
2353 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
|
f90b9bceb8e5
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changeset
|
2354 // flag while there may still be some work to do. (See the comment at |
|
f90b9bceb8e5
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changeset
|
2355 // the beginning of CMTask::do_marking_step() for those conditions - |
|
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2356 // one of which is reaching the specified time target.) It is only |
|
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|
2357 // when CMTask::do_marking_step() returns without setting the |
|
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2358 // has_aborted() flag that the marking step has completed. |
|
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2359 |
|
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|
2360 _task->do_marking_step(1000000000.0 /* something very large */, |
|
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|
2361 true /* do_termination */, |
|
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|
2362 _is_serial); |
|
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|
2363 } while (_task->has_aborted() && !_cm->has_overflown()); |
|
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|
2364 } |
|
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|
2365 }; |
|
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|
2366 |
|
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|
2367 // Implementation of AbstractRefProcTaskExecutor for parallel |
|
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|
2368 // reference processing at the end of G1 concurrent marking |
|
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|
2369 |
|
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2370 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
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|
2371 private: |
|
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|
2372 G1CollectedHeap* _g1h; |
|
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|
2373 ConcurrentMark* _cm; |
|
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|
2374 WorkGang* _workers; |
|
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|
2375 int _active_workers; |
|
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|
2376 |
|
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|
2377 public: |
|
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|
2378 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
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|
2379 ConcurrentMark* cm, |
|
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|
2380 WorkGang* workers, |
|
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|
2381 int n_workers) : |
|
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|
2382 _g1h(g1h), _cm(cm), |
|
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|
2383 _workers(workers), _active_workers(n_workers) { } |
|
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|
2384 |
|
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|
2385 // Executes the given task using concurrent marking worker threads. |
|
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|
2386 virtual void execute(ProcessTask& task); |
|
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|
2387 virtual void execute(EnqueueTask& task); |
|
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|
2388 }; |
|
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|
2389 |
|
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|
2390 class G1CMRefProcTaskProxy: public AbstractGangTask { |
|
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|
2391 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
|
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|
2392 ProcessTask& _proc_task; |
|
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|
2393 G1CollectedHeap* _g1h; |
|
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|
2394 ConcurrentMark* _cm; |
|
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|
2395 |
|
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|
2396 public: |
|
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|
2397 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
|
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|
2398 G1CollectedHeap* g1h, |
|
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|
2399 ConcurrentMark* cm) : |
|
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|
2400 AbstractGangTask("Process reference objects in parallel"), |
|
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|
2401 _proc_task(proc_task), _g1h(g1h), _cm(cm) { |
|
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|
2402 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
|
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|
2403 assert(rp->processing_is_mt(), "shouldn't be here otherwise"); |
|
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|
2404 } |
|
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|
2405 |
|
4728
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|
2406 virtual void work(uint worker_id) { |
|
20306
e02e18f40eae
8050973: CMS/G1 GC: add missing Resource and Handle mark
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diff
changeset
|
2407 ResourceMark rm; |
|
e02e18f40eae
8050973: CMS/G1 GC: add missing Resource and Handle mark
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changeset
|
2408 HandleMark hm; |
|
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|
2409 CMTask* task = _cm->task(worker_id); |
|
2174
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|
2410 G1CMIsAliveClosure g1_is_alive(_g1h); |
|
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|
2411 G1CMKeepAliveAndDrainClosure g1_par_keep_alive(_cm, task, false /* is_serial */); |
|
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|
2412 G1CMDrainMarkingStackClosure g1_par_drain(_cm, task, false /* is_serial */); |
|
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|
2413 |
|
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|
2414 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
|
2174
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|
2415 } |
|
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changeset
|
2416 }; |
|
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changeset
|
2417 |
|
3979
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|
2418 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
2174
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|
2419 assert(_workers != NULL, "Need parallel worker threads."); |
|
8014
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changeset
|
2420 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
|
2174
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|
2421 |
|
4093
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|
2422 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
|
2174
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|
2423 |
|
8788
e864cc14ca75
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diff
changeset
|
2424 // We need to reset the concurrency level before each |
|
e864cc14ca75
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8787
diff
changeset
|
2425 // proxy task execution, so that the termination protocol |
|
e864cc14ca75
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8787
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changeset
|
2426 // and overflow handling in CMTask::do_marking_step() knows |
|
e864cc14ca75
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johnc
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8787
diff
changeset
|
2427 // how many workers to wait for. |
|
e864cc14ca75
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8787
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changeset
|
2428 _cm->set_concurrency(_active_workers); |
|
2174
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changeset
|
2429 _g1h->set_par_threads(_active_workers); |
|
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changeset
|
2430 _workers->run_task(&proc_task_proxy); |
|
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changeset
|
2431 _g1h->set_par_threads(0); |
|
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diff
changeset
|
2432 } |
|
234761c55641
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diff
changeset
|
2433 |
|
3979
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|
2434 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
|
2174
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|
2435 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
234761c55641
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2152
diff
changeset
|
2436 EnqueueTask& _enq_task; |
|
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
changeset
|
2437 |
|
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
2438 public: |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3977
diff
changeset
|
2439 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
2174
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changeset
|
2440 AbstractGangTask("Enqueue reference objects in parallel"), |
|
4093
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changeset
|
2441 _enq_task(enq_task) { } |
|
2174
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changeset
|
2442 |
|
4728
441e946dc1af
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diff
changeset
|
2443 virtual void work(uint worker_id) { |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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changeset
|
2444 _enq_task.work(worker_id); |
|
2174
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diff
changeset
|
2445 } |
|
234761c55641
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2152
diff
changeset
|
2446 }; |
|
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
2447 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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changeset
|
2448 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
2174
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changeset
|
2449 assert(_workers != NULL, "Need parallel worker threads."); |
|
8014
f90b9bceb8e5
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8008
diff
changeset
|
2450 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
|
2174
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changeset
|
2451 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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3977
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changeset
|
2452 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
2174
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|
2453 |
|
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
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8787
diff
changeset
|
2454 // Not strictly necessary but... |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
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8787
diff
changeset
|
2455 // |
|
e864cc14ca75
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8787
diff
changeset
|
2456 // We need to reset the concurrency level before each |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
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8787
diff
changeset
|
2457 // proxy task execution, so that the termination protocol |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
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8787
diff
changeset
|
2458 // and overflow handling in CMTask::do_marking_step() knows |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
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8787
diff
changeset
|
2459 // how many workers to wait for. |
|
e864cc14ca75
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8787
diff
changeset
|
2460 _cm->set_concurrency(_active_workers); |
|
2174
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|
2461 _g1h->set_par_threads(_active_workers); |
|
234761c55641
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changeset
|
2462 _workers->run_task(&enq_task_proxy); |
|
234761c55641
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diff
changeset
|
2463 _g1h->set_par_threads(0); |
|
234761c55641
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2152
diff
changeset
|
2464 } |
|
234761c55641
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2152
diff
changeset
|
2465 |
|
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2466 void ConcurrentMark::weakRefsWorkParallelPart(BoolObjectClosure* is_alive, bool purged_classes) { |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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diff
changeset
|
2467 G1CollectedHeap::heap()->parallel_cleaning(is_alive, true, true, purged_classes); |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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diff
changeset
|
2468 } |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2469 |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2470 // 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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20263
diff
changeset
|
2471 class G1RemarkGCTraceTime : public GCTraceTime { |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
changeset
|
2472 static bool doit_and_prepend(bool doit) { |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2473 if (doit) { |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2474 gclog_or_tty->put(' '); |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2475 } |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2476 return doit; |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2477 } |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2478 |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2479 public: |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2480 G1RemarkGCTraceTime(const char* title, bool doit) |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2481 : GCTraceTime(title, doit_and_prepend(doit), false, G1CollectedHeap::heap()->gc_timer_cm(), |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2482 G1CollectedHeap::heap()->concurrent_mark()->concurrent_gc_id()) { |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2483 } |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2484 }; |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2485 |
| 342 | 2486 void ConcurrentMark::weakRefsWork(bool clear_all_soft_refs) { |
|
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2487 if (has_overflown()) { |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2488 // Skip processing the discovered references if we have |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2489 // overflown the global marking stack. Reference objects |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2490 // only get discovered once so it is OK to not |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2491 // de-populate the discovered reference lists. We could have, |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2492 // but the only benefit would be that, when marking restarts, |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2493 // less reference objects are discovered. |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2494 return; |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2495 } |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2496 |
| 342 | 2497 ResourceMark rm; |
| 2498 HandleMark hm; | |
|
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2499 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2500 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2501 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2502 // Is alive closure. |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2503 G1CMIsAliveClosure g1_is_alive(g1h); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2504 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2505 // Inner scope to exclude the cleaning of the string and symbol |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2506 // tables from the displayed time. |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2507 { |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5988
diff
changeset
|
2508 if (G1Log::finer()) { |
|
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2509 gclog_or_tty->put(' '); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2510 } |
|
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
2511 GCTraceTime t("GC ref-proc", G1Log::finer(), false, g1h->gc_timer_cm(), concurrent_gc_id()); |
|
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2512 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2513 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
|
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2514 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2515 // See the comment in G1CollectedHeap::ref_processing_init() |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2516 // about how reference processing currently works in G1. |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2517 |
|
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2518 // Set the soft reference policy |
|
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2519 rp->setup_policy(clear_all_soft_refs); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2520 assert(_markStack.isEmpty(), "mark stack should be empty"); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2521 |
|
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2522 // Instances of the 'Keep Alive' and 'Complete GC' closures used |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2523 // in serial reference processing. Note these closures are also |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2524 // used for serially processing (by the the current thread) the |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2525 // JNI references during parallel reference processing. |
|
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 // These closures do not need to synchronize with the worker |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2528 // threads involved in parallel reference processing as these |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2529 // instances are executed serially by the current thread (e.g. |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2530 // reference processing is not multi-threaded and is thus |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2531 // performed by the current thread instead of a gang worker). |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2532 // |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2533 // The gang tasks involved in parallel reference procssing create |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2534 // their own instances of these closures, which do their own |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2535 // synchronization among themselves. |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2536 G1CMKeepAliveAndDrainClosure g1_keep_alive(this, task(0), true /* is_serial */); |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2537 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
|
2538 |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2539 // We need at least one active thread. If reference processing |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2540 // is not multi-threaded we use the current (VMThread) thread, |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2541 // otherwise we use the work gang from the G1CollectedHeap and |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2542 // we utilize all the worker threads we can. |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2543 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
|
2544 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
|
2545 active_workers = MAX2(MIN2(active_workers, _max_worker_id), 1U); |
|
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2546 |
|
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2547 // Parallel processing task executor. |
|
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
2548 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2549 g1h->workers(), active_workers); |
|
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2550 AbstractRefProcTaskExecutor* executor = (processing_is_mt ? &par_task_executor : NULL); |
|
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2551 |
|
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2552 // Set the concurrency level. The phase was already set prior to |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2553 // executing the remark task. |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2554 set_concurrency(active_workers); |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2555 |
|
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2556 // Set the degree of MT processing here. If the discovery was done MT, |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2557 // the number of threads involved during discovery could differ from |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2558 // the number of active workers. This is OK as long as the discovered |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2559 // Reference lists are balanced (see balance_all_queues() and balance_queues()). |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2560 rp->set_active_mt_degree(active_workers); |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2561 |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2562 // Process the weak references. |
| 10405 | 2563 const ReferenceProcessorStats& stats = |
| 2564 rp->process_discovered_references(&g1_is_alive, | |
| 2565 &g1_keep_alive, | |
| 2566 &g1_drain_mark_stack, | |
| 2567 executor, | |
|
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
2568 g1h->gc_timer_cm(), |
|
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
2569 concurrent_gc_id()); |
| 10405 | 2570 g1h->gc_tracer_cm()->report_gc_reference_stats(stats); |
|
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2571 |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2572 // The do_oop work routines of the keep_alive and drain_marking_stack |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2573 // 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
|
2574 // global marking stack. |
|
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2575 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2576 assert(_markStack.overflow() || _markStack.isEmpty(), |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2577 "mark stack should be empty (unless it overflowed)"); |
|
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2578 |
|
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2579 if (_markStack.overflow()) { |
|
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2580 // This should have been done already when we tried to push an |
|
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2581 // entry on to the global mark stack. But let's do it again. |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2582 set_has_overflown(); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2583 } |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2584 |
|
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2585 assert(rp->num_q() == active_workers, "why not"); |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2586 |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2587 rp->enqueue_discovered_references(executor); |
|
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2588 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2589 rp->verify_no_references_recorded(); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2590 assert(!rp->discovery_enabled(), "Post condition"); |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2591 } |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2592 |
|
17750
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2593 if (has_overflown()) { |
|
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2594 // 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
|
2595 return; |
|
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2596 } |
|
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2597 |
|
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2598 assert(_markStack.isEmpty(), "Marking should have completed"); |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2599 |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2600 // Unload Klasses, String, Symbols, Code Cache, etc. |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2601 { |
|
20282
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2602 G1RemarkGCTraceTime trace("Unloading", G1Log::finer()); |
|
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2603 |
|
f3aeae1f9fc5
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2604 if (ClassUnloadingWithConcurrentMark) { |
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2605 bool purged_classes; |
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2606 |
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2607 { |
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2608 G1RemarkGCTraceTime trace("System Dictionary Unloading", G1Log::finest()); |
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2609 purged_classes = SystemDictionary::do_unloading(&g1_is_alive); |
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2610 } |
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2611 |
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2612 { |
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2613 G1RemarkGCTraceTime trace("Parallel Unloading", G1Log::finest()); |
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2614 weakRefsWorkParallelPart(&g1_is_alive, purged_classes); |
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2615 } |
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2616 } |
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2617 |
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2618 if (G1StringDedup::is_enabled()) { |
|
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2619 G1RemarkGCTraceTime trace("String Deduplication Unlink", G1Log::finest()); |
|
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2620 G1StringDedup::unlink(&g1_is_alive); |
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2621 } |
|
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2622 } |
| 342 | 2623 } |
| 2624 | |
| 2625 void ConcurrentMark::swapMarkBitMaps() { | |
| 2626 CMBitMapRO* temp = _prevMarkBitMap; | |
| 2627 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
| 2628 _nextMarkBitMap = (CMBitMap*) temp; | |
| 2629 } | |
| 2630 | |
|
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2631 class CMObjectClosure; |
|
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2632 |
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2633 // Closure for iterating over objects, currently only used for |
|
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2634 // processing SATB buffers. |
|
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2635 class CMObjectClosure : public ObjectClosure { |
|
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2636 private: |
|
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2637 CMTask* _task; |
|
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2638 |
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2639 public: |
|
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2640 void do_object(oop obj) { |
|
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2641 _task->deal_with_reference(obj); |
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2642 } |
|
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2643 |
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2644 CMObjectClosure(CMTask* task) : _task(task) { } |
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2645 }; |
|
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2646 |
|
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2647 class G1RemarkThreadsClosure : public ThreadClosure { |
|
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2648 CMObjectClosure _cm_obj; |
|
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2649 G1CMOopClosure _cm_cl; |
|
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2650 MarkingCodeBlobClosure _code_cl; |
|
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2651 int _thread_parity; |
|
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2652 bool _is_par; |
|
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2653 |
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2654 public: |
|
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2655 G1RemarkThreadsClosure(G1CollectedHeap* g1h, CMTask* task, bool is_par) : |
|
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2656 _cm_obj(task), _cm_cl(g1h, g1h->concurrent_mark(), task), _code_cl(&_cm_cl, !CodeBlobToOopClosure::FixRelocations), |
|
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2657 _thread_parity(SharedHeap::heap()->strong_roots_parity()), _is_par(is_par) {} |
|
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2658 |
|
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2659 void do_thread(Thread* thread) { |
|
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2660 if (thread->is_Java_thread()) { |
|
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2661 if (thread->claim_oops_do(_is_par, _thread_parity)) { |
|
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2662 JavaThread* jt = (JavaThread*)thread; |
|
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2663 |
|
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2664 // In theory it should not be neccessary to explicitly walk the nmethods to find roots for concurrent marking |
|
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2665 // however the liveness of oops reachable from nmethods have very complex lifecycles: |
|
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2666 // * Alive if on the stack of an executing method |
|
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2667 // * Weakly reachable otherwise |
|
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2668 // Some objects reachable from nmethods, such as the class loader (or klass_holder) of the receiver should be |
|
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2669 // live by the SATB invariant but other oops recorded in nmethods may behave differently. |
|
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2670 jt->nmethods_do(&_code_cl); |
|
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2671 |
|
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2672 jt->satb_mark_queue().apply_closure_and_empty(&_cm_obj); |
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2673 } |
|
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2674 } else if (thread->is_VM_thread()) { |
|
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2675 if (thread->claim_oops_do(_is_par, _thread_parity)) { |
|
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2676 JavaThread::satb_mark_queue_set().shared_satb_queue()->apply_closure_and_empty(&_cm_obj); |
|
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2677 } |
|
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|
2678 } |
|
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|
2679 } |
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|
2680 }; |
|
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2681 |
| 342 | 2682 class CMRemarkTask: public AbstractGangTask { |
| 2683 private: | |
|
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|
2684 ConcurrentMark* _cm; |
|
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|
2685 bool _is_serial; |
| 342 | 2686 public: |
|
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|
2687 void work(uint worker_id) { |
| 342 | 2688 // Since all available tasks are actually started, we should |
| 2689 // only proceed if we're supposed to be actived. | |
|
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2690 if (worker_id < _cm->active_tasks()) { |
|
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2691 CMTask* task = _cm->task(worker_id); |
| 342 | 2692 task->record_start_time(); |
|
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2693 { |
|
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2694 ResourceMark rm; |
|
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|
2695 HandleMark hm; |
|
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2696 |
|
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2697 G1RemarkThreadsClosure threads_f(G1CollectedHeap::heap(), task, !_is_serial); |
|
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2698 Threads::threads_do(&threads_f); |
|
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2699 } |
|
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2700 |
| 342 | 2701 do { |
|
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|
2702 task->do_marking_step(1000000000.0 /* something very large */, |
|
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|
2703 true /* do_termination */, |
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|
2704 _is_serial); |
| 342 | 2705 } while (task->has_aborted() && !_cm->has_overflown()); |
| 2706 // If we overflow, then we do not want to restart. We instead | |
| 2707 // want to abort remark and do concurrent marking again. | |
| 2708 task->record_end_time(); | |
| 2709 } | |
| 2710 } | |
| 2711 | |
|
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2712 CMRemarkTask(ConcurrentMark* cm, int active_workers, bool is_serial) : |
|
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2713 AbstractGangTask("Par Remark"), _cm(cm), _is_serial(is_serial) { |
| 4711 | 2714 _cm->terminator()->reset_for_reuse(active_workers); |
|
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|
2715 } |
| 342 | 2716 }; |
| 2717 | |
| 2718 void ConcurrentMark::checkpointRootsFinalWork() { | |
| 2719 ResourceMark rm; | |
| 2720 HandleMark hm; | |
| 2721 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 2722 | |
|
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2723 G1RemarkGCTraceTime trace("Finalize Marking", G1Log::finer()); |
|
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2724 |
| 342 | 2725 g1h->ensure_parsability(false); |
| 2726 | |
|
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|
2727 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
2728 G1CollectedHeap::StrongRootsScope srs(g1h); |
|
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|
2729 // this is remark, so we'll use up all active threads |
|
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2730 uint active_workers = g1h->workers()->active_workers(); |
|
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2731 if (active_workers == 0) { |
|
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|
2732 assert(active_workers > 0, "Should have been set earlier"); |
|
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|
2733 active_workers = (uint) ParallelGCThreads; |
|
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|
2734 g1h->workers()->set_active_workers(active_workers); |
|
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|
2735 } |
|
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|
2736 set_concurrency_and_phase(active_workers, false /* concurrent */); |
|
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|
2737 // Leave _parallel_marking_threads at it's |
|
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|
2738 // value originally calculated in the ConcurrentMark |
|
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|
2739 // constructor and pass values of the active workers |
|
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|
2740 // through the gang in the task. |
| 342 | 2741 |
|
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|
2742 CMRemarkTask remarkTask(this, active_workers, false /* is_serial */); |
|
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|
2743 // We will start all available threads, even if we decide that the |
|
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|
2744 // active_workers will be fewer. The extra ones will just bail out |
|
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|
2745 // immediately. |
|
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|
2746 g1h->set_par_threads(active_workers); |
| 342 | 2747 g1h->workers()->run_task(&remarkTask); |
| 2748 g1h->set_par_threads(0); | |
| 2749 } else { | |
|
989
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2750 G1CollectedHeap::StrongRootsScope srs(g1h); |
|
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|
2751 uint active_workers = 1; |
|
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|
2752 set_concurrency_and_phase(active_workers, false /* concurrent */); |
| 342 | 2753 |
|
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|
2754 // Note - if there's no work gang then the VMThread will be |
|
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|
2755 // the thread to execute the remark - serially. We have |
|
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|
2756 // to pass true for the is_serial parameter so that |
|
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|
2757 // CMTask::do_marking_step() doesn't enter the sync |
|
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|
2758 // barriers in the event of an overflow. Doing so will |
|
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|
2759 // cause an assert that the current thread is not a |
|
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|
2760 // concurrent GC thread. |
|
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|
2761 CMRemarkTask remarkTask(this, active_workers, true /* is_serial*/); |
| 342 | 2762 remarkTask.work(0); |
| 2763 } | |
|
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|
2764 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
|
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|
2765 guarantee(has_overflown() || |
|
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|
2766 satb_mq_set.completed_buffers_num() == 0, |
|
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|
2767 err_msg("Invariant: has_overflown = %s, num buffers = %d", |
|
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|
2768 BOOL_TO_STR(has_overflown()), |
|
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|
2769 satb_mq_set.completed_buffers_num())); |
| 342 | 2770 |
| 2771 print_stats(); | |
| 2772 } | |
| 2773 | |
| 1044 | 2774 #ifndef PRODUCT |
| 2775 | |
| 1388 | 2776 class PrintReachableOopClosure: public OopClosure { |
| 342 | 2777 private: |
| 2778 G1CollectedHeap* _g1h; | |
| 2779 outputStream* _out; | |
|
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|
2780 VerifyOption _vo; |
| 1388 | 2781 bool _all; |
| 342 | 2782 |
| 2783 public: | |
|
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|
2784 PrintReachableOopClosure(outputStream* out, |
|
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|
2785 VerifyOption vo, |
| 1388 | 2786 bool all) : |
| 1044 | 2787 _g1h(G1CollectedHeap::heap()), |
|
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|
2788 _out(out), _vo(vo), _all(all) { } |
| 342 | 2789 |
|
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|
2790 void do_oop(narrowOop* p) { do_oop_work(p); } |
|
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|
2791 void do_oop( oop* p) { do_oop_work(p); } |
|
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|
2792 |
|
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|
2793 template <class T> void do_oop_work(T* p) { |
|
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|
2794 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 2795 const char* str = NULL; |
| 2796 const char* str2 = ""; | |
| 2797 | |
| 1388 | 2798 if (obj == NULL) { |
| 2799 str = ""; | |
| 2800 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
| 2801 str = " O"; | |
| 2802 } else { | |
| 342 | 2803 HeapRegion* hr = _g1h->heap_region_containing(obj); |
|
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|
2804 bool over_tams = _g1h->allocated_since_marking(obj, hr, _vo); |
|
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|
2805 bool marked = _g1h->is_marked(obj, _vo); |
| 1044 | 2806 |
| 2807 if (over_tams) { | |
| 1388 | 2808 str = " >"; |
| 2809 if (marked) { | |
| 342 | 2810 str2 = " AND MARKED"; |
| 1044 | 2811 } |
| 1388 | 2812 } else if (marked) { |
| 2813 str = " M"; | |
| 1044 | 2814 } else { |
| 1388 | 2815 str = " NOT"; |
| 1044 | 2816 } |
| 342 | 2817 } |
| 2818 | |
| 1388 | 2819 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
|
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|
2820 p2i(p), p2i((void*) obj), str, str2); |
| 342 | 2821 } |
| 2822 }; | |
| 2823 | |
| 1388 | 2824 class PrintReachableObjectClosure : public ObjectClosure { |
| 342 | 2825 private: |
|
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|
2826 G1CollectedHeap* _g1h; |
|
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|
2827 outputStream* _out; |
|
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|
2828 VerifyOption _vo; |
|
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|
2829 bool _all; |
|
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|
2830 HeapRegion* _hr; |
| 342 | 2831 |
| 2832 public: | |
|
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|
2833 PrintReachableObjectClosure(outputStream* out, |
|
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|
2834 VerifyOption vo, |
| 1388 | 2835 bool all, |
| 2836 HeapRegion* hr) : | |
|
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|
2837 _g1h(G1CollectedHeap::heap()), |
|
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|
2838 _out(out), _vo(vo), _all(all), _hr(hr) { } |
| 1388 | 2839 |
| 2840 void do_object(oop o) { | |
|
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|
2841 bool over_tams = _g1h->allocated_since_marking(o, _hr, _vo); |
|
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|
2842 bool marked = _g1h->is_marked(o, _vo); |
| 1388 | 2843 bool print_it = _all || over_tams || marked; |
| 2844 | |
| 2845 if (print_it) { | |
| 2846 _out->print_cr(" "PTR_FORMAT"%s", | |
|
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|
2847 p2i((void *)o), (over_tams) ? " >" : (marked) ? " M" : ""); |
|
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|
2848 PrintReachableOopClosure oopCl(_out, _vo, _all); |
|
6725
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6964458: Reimplement class meta-data storage to use native memory
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changeset
|
2849 o->oop_iterate_no_header(&oopCl); |
| 1388 | 2850 } |
| 342 | 2851 } |
| 2852 }; | |
| 2853 | |
| 1388 | 2854 class PrintReachableRegionClosure : public HeapRegionClosure { |
| 342 | 2855 private: |
|
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|
2856 G1CollectedHeap* _g1h; |
|
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|
2857 outputStream* _out; |
|
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|
2858 VerifyOption _vo; |
|
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|
2859 bool _all; |
| 342 | 2860 |
| 2861 public: | |
| 2862 bool doHeapRegion(HeapRegion* hr) { | |
| 2863 HeapWord* b = hr->bottom(); | |
| 2864 HeapWord* e = hr->end(); | |
| 2865 HeapWord* t = hr->top(); | |
|
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|
2866 HeapWord* p = _g1h->top_at_mark_start(hr, _vo); |
| 342 | 2867 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
|
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|
2868 "TAMS: " PTR_FORMAT, p2i(b), p2i(e), p2i(t), p2i(p)); |
| 1388 | 2869 _out->cr(); |
| 2870 | |
| 2871 HeapWord* from = b; | |
| 2872 HeapWord* to = t; | |
| 2873 | |
| 2874 if (to > from) { | |
|
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|
2875 _out->print_cr("Objects in [" PTR_FORMAT ", " PTR_FORMAT "]", p2i(from), p2i(to)); |
| 1388 | 2876 _out->cr(); |
|
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|
2877 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
| 1388 | 2878 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
| 2879 _out->cr(); | |
| 2880 } | |
| 342 | 2881 |
| 2882 return false; | |
| 2883 } | |
| 2884 | |
|
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|
2885 PrintReachableRegionClosure(outputStream* out, |
|
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|
2886 VerifyOption vo, |
| 1388 | 2887 bool all) : |
|
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|
2888 _g1h(G1CollectedHeap::heap()), _out(out), _vo(vo), _all(all) { } |
| 342 | 2889 }; |
| 2890 | |
| 1388 | 2891 void ConcurrentMark::print_reachable(const char* str, |
|
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|
2892 VerifyOption vo, |
| 1388 | 2893 bool all) { |
| 2894 gclog_or_tty->cr(); | |
| 2895 gclog_or_tty->print_cr("== Doing heap dump... "); | |
| 1044 | 2896 |
| 2897 if (G1PrintReachableBaseFile == NULL) { | |
| 2898 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
| 2899 return; | |
| 2900 } | |
| 2901 | |
| 2902 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
| 2903 (JVM_MAXPATHLEN - 1)) { | |
| 2904 gclog_or_tty->print_cr(" #### error: file name too long"); | |
| 2905 return; | |
| 2906 } | |
| 2907 | |
| 2908 char file_name[JVM_MAXPATHLEN]; | |
| 2909 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
| 2910 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
| 2911 | |
| 2912 fileStream fout(file_name); | |
| 2913 if (!fout.is_open()) { | |
| 2914 gclog_or_tty->print_cr(" #### error: could not open file"); | |
| 2915 return; | |
| 2916 } | |
| 2917 | |
| 2918 outputStream* out = &fout; | |
|
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|
2919 out->print_cr("-- USING %s", _g1h->top_at_mark_start_str(vo)); |
| 1044 | 2920 out->cr(); |
| 2921 | |
| 1388 | 2922 out->print_cr("--- ITERATING OVER REGIONS"); |
| 1044 | 2923 out->cr(); |
|
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|
2924 PrintReachableRegionClosure rcl(out, vo, all); |
| 1388 | 2925 _g1h->heap_region_iterate(&rcl); |
| 1044 | 2926 out->cr(); |
| 2927 | |
| 2928 gclog_or_tty->print_cr(" done"); | |
| 1388 | 2929 gclog_or_tty->flush(); |
| 342 | 2930 } |
| 2931 | |
| 1044 | 2932 #endif // PRODUCT |
| 2933 | |
|
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|
2934 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
| 342 | 2935 // Note we are overriding the read-only view of the prev map here, via |
| 2936 // the cast. | |
| 2937 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
|
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|
2938 } |
|
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|
2939 |
|
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|
2940 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
| 342 | 2941 _nextMarkBitMap->clearRange(mr); |
| 2942 } | |
| 2943 | |
| 2944 HeapRegion* | |
|
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|
2945 ConcurrentMark::claim_region(uint worker_id) { |
| 342 | 2946 // "checkpoint" the finger |
| 2947 HeapWord* finger = _finger; | |
| 2948 | |
| 2949 // _heap_end will not change underneath our feet; it only changes at | |
| 2950 // yield points. | |
| 2951 while (finger < _heap_end) { | |
|
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|
2952 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
| 342 | 2953 |
| 3771 | 2954 // Note on how this code handles humongous regions. In the |
| 2955 // normal case the finger will reach the start of a "starts | |
| 2956 // humongous" (SH) region. Its end will either be the end of the | |
| 2957 // last "continues humongous" (CH) region in the sequence, or the | |
| 2958 // standard end of the SH region (if the SH is the only region in | |
| 2959 // the sequence). That way claim_region() will skip over the CH | |
| 2960 // regions. However, there is a subtle race between a CM thread | |
| 2961 // executing this method and a mutator thread doing a humongous | |
| 2962 // object allocation. The two are not mutually exclusive as the CM | |
| 2963 // thread does not need to hold the Heap_lock when it gets | |
| 2964 // here. So there is a chance that claim_region() will come across | |
| 2965 // a free region that's in the progress of becoming a SH or a CH | |
| 2966 // region. In the former case, it will either | |
| 2967 // a) Miss the update to the region's end, in which case it will | |
| 2968 // visit every subsequent CH region, will find their bitmaps | |
| 2969 // empty, and do nothing, or | |
| 2970 // b) Will observe the update of the region's end (in which case | |
| 2971 // it will skip the subsequent CH regions). | |
| 2972 // If it comes across a region that suddenly becomes CH, the | |
| 2973 // scenario will be similar to b). So, the race between | |
| 2974 // claim_region() and a humongous object allocation might force us | |
| 2975 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
| 2976 // iterations) but it should not introduce and correctness issues. | |
| 20337 | 2977 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); |
| 2978 | |
| 2979 // Above heap_region_containing_raw may return NULL as we always scan claim | |
| 2980 // until the end of the heap. In this case, just jump to the next region. | |
| 2981 HeapWord* end = curr_region != NULL ? curr_region->end() : finger + HeapRegion::GrainWords; | |
| 3771 | 2982 |
| 2983 // Is the gap between reading the finger and doing the CAS too long? | |
| 2984 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
| 20337 | 2985 if (res == finger && curr_region != NULL) { |
| 342 | 2986 // we succeeded |
| 20337 | 2987 HeapWord* bottom = curr_region->bottom(); |
| 2988 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
| 2989 | |
| 2990 if (verbose_low()) { | |
| 2991 gclog_or_tty->print_cr("[%u] curr_region = "PTR_FORMAT" " | |
| 2992 "["PTR_FORMAT", "PTR_FORMAT"), " | |
| 2993 "limit = "PTR_FORMAT, | |
| 2994 worker_id, p2i(curr_region), p2i(bottom), p2i(end), p2i(limit)); | |
| 2995 } | |
| 342 | 2996 |
| 2997 // notice that _finger == end cannot be guaranteed here since, | |
| 2998 // someone else might have moved the finger even further | |
|
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|
2999 assert(_finger >= end, "the finger should have moved forward"); |
| 342 | 3000 |
|
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|
3001 if (verbose_low()) { |
|
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|
3002 gclog_or_tty->print_cr("[%u] we were successful with region = " |
|
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|
3003 PTR_FORMAT, worker_id, p2i(curr_region)); |
|
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|
3004 } |
| 342 | 3005 |
| 3006 if (limit > bottom) { | |
|
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|
3007 if (verbose_low()) { |
|
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|
3008 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is not empty, " |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
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17844
diff
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|
3009 "returning it ", worker_id, p2i(curr_region)); |
|
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
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|
3010 } |
| 342 | 3011 return curr_region; |
| 3012 } else { | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3013 assert(limit == bottom, |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3014 "the region limit should be at bottom"); |
|
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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diff
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|
3015 if (verbose_low()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3016 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is empty, " |
|
17937
78bbf4d43a14
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|
3017 "returning NULL", worker_id, p2i(curr_region)); |
|
3776
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|
3018 } |
| 342 | 3019 // we return NULL and the caller should try calling |
| 3020 // claim_region() again. | |
| 3021 return NULL; | |
| 3022 } | |
| 3023 } else { | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
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|
3024 assert(_finger > finger, "the finger should have moved forward"); |
|
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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parents:
3772
diff
changeset
|
3025 if (verbose_low()) { |
| 20337 | 3026 if (curr_region == NULL) { |
| 3027 gclog_or_tty->print_cr("[%u] found uncommitted region, moving finger, " | |
| 3028 "global finger = "PTR_FORMAT", " | |
| 3029 "our finger = "PTR_FORMAT, | |
| 3030 worker_id, p2i(_finger), p2i(finger)); | |
| 3031 } else { | |
| 3032 gclog_or_tty->print_cr("[%u] somebody else moved the finger, " | |
| 3033 "global finger = "PTR_FORMAT", " | |
| 3034 "our finger = "PTR_FORMAT, | |
| 3035 worker_id, p2i(_finger), p2i(finger)); | |
| 3036 } | |
|
3776
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|
3037 } |
| 342 | 3038 |
| 3039 // read it again | |
| 3040 finger = _finger; | |
| 3041 } | |
| 3042 } | |
| 3043 | |
| 3044 return NULL; | |
| 3045 } | |
| 3046 | |
|
4787
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|
3047 #ifndef PRODUCT |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3048 enum VerifyNoCSetOopsPhase { |
|
2ace1c4ee8da
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|
3049 VerifyNoCSetOopsStack, |
|
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|
3050 VerifyNoCSetOopsQueues, |
|
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|
3051 VerifyNoCSetOopsSATBCompleted, |
|
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|
3052 VerifyNoCSetOopsSATBThread |
|
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|
3053 }; |
|
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|
3054 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3055 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
|
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|
3056 private: |
|
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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|
3057 G1CollectedHeap* _g1h; |
|
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|
3058 VerifyNoCSetOopsPhase _phase; |
|
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|
3059 int _info; |
|
2ace1c4ee8da
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tonyp
parents:
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|
3060 |
|
2ace1c4ee8da
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|
3061 const char* phase_str() { |
|
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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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|
3062 switch (_phase) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3063 case VerifyNoCSetOopsStack: return "Stack"; |
|
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3064 case VerifyNoCSetOopsQueues: return "Queue"; |
|
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|
3065 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
|
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|
3066 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
|
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|
3067 default: ShouldNotReachHere(); |
|
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|
3068 } |
|
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diff
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|
3069 return NULL; |
|
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|
3070 } |
|
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parents:
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|
3071 |
|
2ace1c4ee8da
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parents:
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diff
changeset
|
3072 void do_object_work(oop obj) { |
|
2ace1c4ee8da
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|
3073 guarantee(!_g1h->obj_in_cs(obj), |
|
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parents:
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diff
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|
3074 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
|
17937
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8037816: Fix for 8036122 breaks build with Xcode5/clang
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|
3075 p2i((void*) obj), phase_str(), _info)); |
|
4787
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|
3076 } |
|
2ace1c4ee8da
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diff
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|
3077 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
3078 public: |
|
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parents:
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|
3079 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
|
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|
3080 |
|
2ace1c4ee8da
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parents:
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diff
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|
3081 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
|
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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|
3082 _phase = phase; |
|
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
3083 _info = info; |
|
2ace1c4ee8da
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tonyp
parents:
4783
diff
changeset
|
3084 } |
|
2ace1c4ee8da
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tonyp
parents:
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diff
changeset
|
3085 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3086 virtual void do_oop(oop* p) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3087 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
|
3088 do_object_work(obj); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3089 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3090 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3091 virtual void do_oop(narrowOop* p) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3092 // 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
|
3093 // stacks and SATB buffers. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3094 ShouldNotReachHere(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3095 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3096 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3097 virtual void do_object(oop obj) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3098 do_object_work(obj); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3099 } |
|
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:
4783
diff
changeset
|
3101 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3102 void ConcurrentMark::verify_no_cset_oops(bool verify_stacks, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3103 bool verify_enqueued_buffers, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3104 bool verify_thread_buffers, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3105 bool verify_fingers) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3106 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
|
3107 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3108 return; |
| 342 | 3109 } |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3110 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3111 VerifyNoCSetOopsClosure cl; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3112 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3113 if (verify_stacks) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3114 // Verify entries on the global mark stack |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3115 cl.set_phase(VerifyNoCSetOopsStack); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3116 _markStack.oops_do(&cl); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3117 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3118 // Verify entries on the task queues |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3119 for (uint i = 0; i < _max_worker_id; i += 1) { |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3120 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
|
3121 CMTaskQueue* queue = _task_queues->queue(i); |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3122 queue->oops_do(&cl); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3123 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3124 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3125 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3126 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3127 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3128 // Verify entries on the enqueued SATB buffers |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3129 if (verify_enqueued_buffers) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3130 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3131 satb_qs.iterate_completed_buffers_read_only(&cl); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3132 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3133 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3134 // Verify entries on the per-thread SATB buffers |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3135 if (verify_thread_buffers) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3136 cl.set_phase(VerifyNoCSetOopsSATBThread); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3137 satb_qs.iterate_thread_buffers_read_only(&cl); |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3138 } |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3139 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4783
diff
changeset
|
3140 if (verify_fingers) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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4783
diff
changeset
|
3141 // Verify the global finger |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4783
diff
changeset
|
3142 HeapWord* global_finger = finger(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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4783
diff
changeset
|
3143 if (global_finger != NULL && global_finger < _heap_end) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3144 // The global finger always points to a heap region boundary. We |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3145 // use heap_region_containing_raw() to get the containing region |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3146 // given that the global finger could be pointing to a free region |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3147 // which subsequently becomes continues humongous. If that |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3148 // happens, heap_region_containing() will return the bottom of the |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3149 // corresponding starts humongous region and the check below will |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3150 // not hold any more. |
| 20337 | 3151 // Since we always iterate over all regions, we might get a NULL HeapRegion |
| 3152 // here. | |
|
4787
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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|
3153 HeapRegion* global_hr = _g1h->heap_region_containing_raw(global_finger); |
| 20337 | 3154 guarantee(global_hr == NULL || global_finger == global_hr->bottom(), |
|
4787
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tonyp
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diff
changeset
|
3155 err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
17937
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8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
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diff
changeset
|
3156 p2i(global_finger), HR_FORMAT_PARAMS(global_hr))); |
|
4787
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|
3157 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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diff
changeset
|
3158 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
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diff
changeset
|
3159 // Verify the task fingers |
|
6862
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7127708: G1: change task num types from int to uint in concurrent mark
johnc
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6812
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changeset
|
3160 assert(parallel_marking_threads() <= _max_worker_id, "sanity"); |
|
4787
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diff
changeset
|
3161 for (int i = 0; i < (int) parallel_marking_threads(); i += 1) { |
|
2ace1c4ee8da
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diff
changeset
|
3162 CMTask* task = _tasks[i]; |
|
2ace1c4ee8da
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changeset
|
3163 HeapWord* task_finger = task->finger(); |
|
2ace1c4ee8da
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parents:
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diff
changeset
|
3164 if (task_finger != NULL && task_finger < _heap_end) { |
|
2ace1c4ee8da
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parents:
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diff
changeset
|
3165 // See above note on the global finger verification. |
|
2ace1c4ee8da
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diff
changeset
|
3166 HeapRegion* task_hr = _g1h->heap_region_containing_raw(task_finger); |
| 20337 | 3167 guarantee(task_hr == NULL || task_finger == task_hr->bottom() || |
|
4787
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changeset
|
3168 !task_hr->in_collection_set(), |
|
2ace1c4ee8da
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changeset
|
3169 err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
17937
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drchase
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diff
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|
3170 p2i(task_finger), HR_FORMAT_PARAMS(task_hr))); |
|
4787
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|
3171 } |
|
2ace1c4ee8da
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diff
changeset
|
3172 } |
|
2ace1c4ee8da
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|
3173 } |
| 342 | 3174 } |
|
4787
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|
3175 #endif // PRODUCT |
| 342 | 3176 |
|
4836
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|
3177 // Aggregate the counting data that was constructed concurrently |
|
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diff
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|
3178 // with marking. |
|
d30fa85f9994
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|
3179 class AggregateCountDataHRClosure: public HeapRegionClosure { |
|
6812
988bf00cc564
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|
3180 G1CollectedHeap* _g1h; |
|
4836
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|
3181 ConcurrentMark* _cm; |
|
6812
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|
3182 CardTableModRefBS* _ct_bs; |
|
4836
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|
3183 BitMap* _cm_card_bm; |
|
6862
8a5ea0a9ccc4
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changeset
|
3184 uint _max_worker_id; |
|
4836
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|
3185 |
|
d30fa85f9994
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|
3186 public: |
|
6812
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|
3187 AggregateCountDataHRClosure(G1CollectedHeap* g1h, |
|
4836
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|
3188 BitMap* cm_card_bm, |
|
6862
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diff
changeset
|
3189 uint max_worker_id) : |
|
6812
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changeset
|
3190 _g1h(g1h), _cm(g1h->concurrent_mark()), |
|
988bf00cc564
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|
3191 _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
|
6862
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changeset
|
3192 _cm_card_bm(cm_card_bm), _max_worker_id(max_worker_id) { } |
|
4836
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|
3193 |
|
d30fa85f9994
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|
3194 bool doHeapRegion(HeapRegion* hr) { |
|
d30fa85f9994
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|
3195 if (hr->continuesHumongous()) { |
|
d30fa85f9994
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|
3196 // We will ignore these here and process them when their |
|
d30fa85f9994
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|
3197 // associated "starts humongous" region is processed. |
|
d30fa85f9994
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|
3198 // Note that we cannot rely on their associated |
|
d30fa85f9994
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diff
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|
3199 // "starts humongous" region to have their bit set to 1 |
|
d30fa85f9994
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diff
changeset
|
3200 // since, due to the region chunking in the parallel region |
|
d30fa85f9994
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4830
diff
changeset
|
3201 // iteration, a "continues humongous" region might be visited |
|
d30fa85f9994
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diff
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|
3202 // before its associated "starts humongous". |
|
d30fa85f9994
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diff
changeset
|
3203 return false; |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
3204 } |
|
d30fa85f9994
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parents:
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diff
changeset
|
3205 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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4830
diff
changeset
|
3206 HeapWord* start = hr->bottom(); |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
3207 HeapWord* limit = hr->next_top_at_mark_start(); |
|
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3208 HeapWord* end = hr->end(); |
|
d30fa85f9994
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4830
diff
changeset
|
3209 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3210 assert(start <= limit && limit <= hr->top() && hr->top() <= hr->end(), |
|
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3211 err_msg("Preconditions not met - " |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3212 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3213 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
3214 p2i(start), p2i(limit), p2i(hr->top()), p2i(hr->end()))); |
|
4836
d30fa85f9994
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parents:
4830
diff
changeset
|
3215 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3216 assert(hr->next_marked_bytes() == 0, "Precondition"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3217 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3218 if (start == limit) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3219 // NTAMS of this region has not been set so nothing to do. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3220 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3221 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3222 |
|
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3223 // 'start' should be in the heap. |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3224 assert(_g1h->is_in_g1_reserved(start) && _ct_bs->is_card_aligned(start), "sanity"); |
|
988bf00cc564
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parents:
6750
diff
changeset
|
3225 // 'end' *may* be just beyone the end of the heap (if hr is the last region) |
|
988bf00cc564
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johnc
parents:
6750
diff
changeset
|
3226 assert(!_g1h->is_in_g1_reserved(end) || _ct_bs->is_card_aligned(end), "sanity"); |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3227 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3228 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3229 BitMap::idx_t limit_idx = _cm->card_bitmap_index_for(limit); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3230 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(end); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
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|
3231 |
|
6812
988bf00cc564
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parents:
6750
diff
changeset
|
3232 // If ntams is not card aligned then we bump card bitmap index |
|
988bf00cc564
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johnc
parents:
6750
diff
changeset
|
3233 // for limit so that we get the all the cards spanned by |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3234 // the object ending at ntams. |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
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parents:
6750
diff
changeset
|
3235 // Note: if this is the last region in the heap then ntams |
|
988bf00cc564
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johnc
parents:
6750
diff
changeset
|
3236 // could be actually just beyond the end of the the heap; |
|
988bf00cc564
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johnc
parents:
6750
diff
changeset
|
3237 // limit_idx will then correspond to a (non-existent) card |
|
988bf00cc564
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johnc
parents:
6750
diff
changeset
|
3238 // that is also outside the heap. |
|
988bf00cc564
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parents:
6750
diff
changeset
|
3239 if (_g1h->is_in_g1_reserved(limit) && !_ct_bs->is_card_aligned(limit)) { |
|
4836
d30fa85f9994
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parents:
4830
diff
changeset
|
3240 limit_idx += 1; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3241 } |
|
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3242 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3243 assert(limit_idx <= end_idx, "or else use atomics"); |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
3244 |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
3245 // Aggregate the "stripe" in the count data associated with hr. |
|
20377
a8ea2f110d87
8054819: Rename HeapRegionSeq to HeapRegionManager
tschatzl
parents:
20337
diff
changeset
|
3246 uint hrm_index = hr->hrm_index(); |
|
4836
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|
3247 size_t marked_bytes = 0; |
|
d30fa85f9994
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4830
diff
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|
3248 |
|
6862
8a5ea0a9ccc4
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johnc
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6812
diff
changeset
|
3249 for (uint i = 0; i < _max_worker_id; i += 1) { |
|
4836
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diff
changeset
|
3250 size_t* marked_bytes_array = _cm->count_marked_bytes_array_for(i); |
|
d30fa85f9994
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|
3251 BitMap* task_card_bm = _cm->count_card_bitmap_for(i); |
|
d30fa85f9994
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diff
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|
3252 |
|
d30fa85f9994
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4830
diff
changeset
|
3253 // Fetch the marked_bytes in this region for task i and |
|
d30fa85f9994
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4830
diff
changeset
|
3254 // add it to the running total for this region. |
|
20377
a8ea2f110d87
8054819: Rename HeapRegionSeq to HeapRegionManager
tschatzl
parents:
20337
diff
changeset
|
3255 marked_bytes += marked_bytes_array[hrm_index]; |
|
4836
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4830
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changeset
|
3256 |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3257 // Now union the bitmaps[0,max_worker_id)[start_idx..limit_idx) |
|
4836
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4830
diff
changeset
|
3258 // into the global card bitmap. |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
3259 BitMap::idx_t scan_idx = task_card_bm->get_next_one_offset(start_idx, limit_idx); |
|
d30fa85f9994
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4830
diff
changeset
|
3260 |
|
d30fa85f9994
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4830
diff
changeset
|
3261 while (scan_idx < limit_idx) { |
|
d30fa85f9994
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4830
diff
changeset
|
3262 assert(task_card_bm->at(scan_idx) == true, "should be"); |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
3263 _cm_card_bm->set_bit(scan_idx); |
|
d30fa85f9994
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4830
diff
changeset
|
3264 assert(_cm_card_bm->at(scan_idx) == true, "should be"); |
|
d30fa85f9994
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4830
diff
changeset
|
3265 |
|
d30fa85f9994
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4830
diff
changeset
|
3266 // BitMap::get_next_one_offset() can handle the case when |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
3267 // its left_offset parameter is greater than its right_offset |
|
6812
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6750
diff
changeset
|
3268 // parameter. It does, however, have an early exit if |
|
4836
d30fa85f9994
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parents:
4830
diff
changeset
|
3269 // left_offset == right_offset. So let's limit the value |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3270 // passed in for left offset here. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3271 BitMap::idx_t next_idx = MIN2(scan_idx + 1, limit_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3272 scan_idx = task_card_bm->get_next_one_offset(next_idx, limit_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3273 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3274 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3275 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3276 // Update the marked bytes for this region. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3277 hr->add_to_marked_bytes(marked_bytes); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3278 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3279 // Next heap region |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3280 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3281 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3282 }; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3283 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3284 class G1AggregateCountDataTask: public AbstractGangTask { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3285 protected: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3286 G1CollectedHeap* _g1h; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3287 ConcurrentMark* _cm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3288 BitMap* _cm_card_bm; |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3289 uint _max_worker_id; |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3290 int _active_workers; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3291 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3292 public: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3293 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3294 ConcurrentMark* cm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3295 BitMap* cm_card_bm, |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3296 uint max_worker_id, |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3297 int n_workers) : |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3298 AbstractGangTask("Count Aggregation"), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3299 _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
|
3300 _max_worker_id(max_worker_id), |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3301 _active_workers(n_workers) { } |
|
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 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
|
3304 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
|
3305 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3306 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3307 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3308 _active_workers, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3309 HeapRegion::AggregateCountClaimValue); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3310 } else { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3311 _g1h->heap_region_iterate(&cl); |
|
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 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3314 }; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3315 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3316 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3317 void ConcurrentMark::aggregate_count_data() { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3318 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3319 _g1h->workers()->active_workers() : |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3320 1); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3321 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3322 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
|
3323 _max_worker_id, n_workers); |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3324 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3325 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3326 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3327 "sanity check"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3328 _g1h->set_par_threads(n_workers); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3329 _g1h->workers()->run_task(&g1_par_agg_task); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3330 _g1h->set_par_threads(0); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3331 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3332 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3333 "sanity check"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3334 _g1h->reset_heap_region_claim_values(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3335 } else { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3336 g1_par_agg_task.work(0); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3337 } |
|
20445
e5668dcf12e9
8057818: collect allocation context statistics at gc pauses
jcoomes
parents:
20386
diff
changeset
|
3338 _g1h->allocation_context_stats().update_at_remark(); |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3339 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3340 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3341 // 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
|
3342 void ConcurrentMark::clear_all_count_data() { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3343 // 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
|
3344 // liveness count aggregation (during remark) and the |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3345 // final counting task. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3346 _card_bm.clear(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3347 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3348 // 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
|
3349 // of the final counting task. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3350 _region_bm.clear(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3351 |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3352 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
|
3353 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
|
3354 |
|
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3355 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
|
3356 BitMap* task_card_bm = count_card_bitmap_for(i); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3357 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
|
3358 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3359 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
|
3360 assert(marked_bytes_array != NULL, "uninitialized"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3361 |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3362 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
|
3363 task_card_bm->clear(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3364 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3365 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3366 |
| 342 | 3367 void ConcurrentMark::print_stats() { |
| 3368 if (verbose_stats()) { | |
| 3369 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3370 for (size_t i = 0; i < _active_tasks; ++i) { | |
| 3371 _tasks[i]->print_stats(); | |
| 3372 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3373 } | |
| 3374 } | |
| 3375 } | |
| 3376 | |
| 3377 // abandon current marking iteration due to a Full GC | |
| 3378 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
|
3379 // 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
|
3380 // concurrent bitmap clearing. |
| 342 | 3381 _nextMarkBitMap->clearAll(); |
|
20291
e0954897238a
7132678: G1: verify that the marking bitmaps have no marks for objects over TAMS
brutisso
parents:
20282
diff
changeset
|
3382 |
|
e0954897238a
7132678: G1: verify that the marking bitmaps have no marks for objects over TAMS
brutisso
parents:
20282
diff
changeset
|
3383 // 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
|
3384 // 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
|
3385 // 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
|
3386 |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3387 // Clear the liveness counting data |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3388 clear_all_count_data(); |
| 342 | 3389 // Empty mark stack |
|
7450
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
johnc
parents:
7397
diff
changeset
|
3390 reset_marking_state(); |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3391 for (uint i = 0; i < _max_worker_id; ++i) { |
| 342 | 3392 _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
|
3393 } |
|
17949
487f09bf44e0
8040803: G1: Concurrent mark hangs when mark stack overflows
pliden
parents:
17937
diff
changeset
|
3394 _first_overflow_barrier_sync.abort(); |
|
487f09bf44e0
8040803: G1: Concurrent mark hangs when mark stack overflows
pliden
parents:
17937
diff
changeset
|
3395 _second_overflow_barrier_sync.abort(); |
|
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
3396 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
|
3397 if (!gc_id.is_undefined()) { |
|
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
3398 // 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
|
3399 // 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
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|
3400 _aborted_gc_id = gc_id; |
|
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|
3401 } |
| 342 | 3402 _has_aborted = true; |
| 3403 | |
| 3404 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3405 satb_mq_set.abandon_partial_marking(); | |
|
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|
3406 // This can be called either during or outside marking, we'll read |
|
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|
3407 // the expected_active value from the SATB queue set. |
|
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|
3408 satb_mq_set.set_active_all_threads( |
|
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|
3409 false, /* new active value */ |
|
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|
3410 satb_mq_set.is_active() /* expected_active */); |
| 10405 | 3411 |
| 3412 _g1h->trace_heap_after_concurrent_cycle(); | |
| 3413 _g1h->register_concurrent_cycle_end(); | |
| 342 | 3414 } |
| 3415 | |
|
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|
3416 const GCId& ConcurrentMark::concurrent_gc_id() { |
|
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|
3417 if (has_aborted()) { |
|
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|
3418 return _aborted_gc_id; |
|
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|
3419 } |
|
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|
3420 return _g1h->gc_tracer_cm()->gc_id(); |
|
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|
3421 } |
|
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|
3422 |
| 342 | 3423 static void print_ms_time_info(const char* prefix, const char* name, |
| 3424 NumberSeq& ns) { | |
| 3425 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
| 3426 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
| 3427 if (ns.num() > 0) { | |
| 3428 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
| 3429 prefix, ns.sd(), ns.maximum()); | |
| 3430 } | |
| 3431 } | |
| 3432 | |
| 3433 void ConcurrentMark::print_summary_info() { | |
| 3434 gclog_or_tty->print_cr(" Concurrent marking:"); | |
| 3435 print_ms_time_info(" ", "init marks", _init_times); | |
| 3436 print_ms_time_info(" ", "remarks", _remark_times); | |
| 3437 { | |
| 3438 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
| 3439 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
| 3440 | |
| 3441 } | |
| 3442 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
| 3443 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
| 3444 _total_counting_time, | |
| 3445 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
| 3446 (double)_cleanup_times.num() | |
| 3447 : 0.0)); | |
| 3448 if (G1ScrubRemSets) { | |
| 3449 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
| 3450 _total_rs_scrub_time, | |
| 3451 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
| 3452 (double)_cleanup_times.num() | |
| 3453 : 0.0)); | |
| 3454 } | |
| 3455 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
| 3456 (_init_times.sum() + _remark_times.sum() + | |
| 3457 _cleanup_times.sum())/1000.0); | |
| 3458 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
|
4836
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|
3459 "(%8.2f s marking).", |
| 342 | 3460 cmThread()->vtime_accum(), |
|
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|
3461 cmThread()->vtime_mark_accum()); |
| 342 | 3462 } |
| 3463 | |
| 1019 | 3464 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
|
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|
3465 if (use_parallel_marking_threads()) { |
|
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|
3466 _parallel_workers->print_worker_threads_on(st); |
|
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|
3467 } |
| 1019 | 3468 } |
| 3469 | |
|
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|
3470 void ConcurrentMark::print_on_error(outputStream* st) const { |
|
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|
3471 st->print_cr("Marking Bits (Prev, Next): (CMBitMap*) " PTR_FORMAT ", (CMBitMap*) " PTR_FORMAT, |
|
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|
3472 p2i(_prevMarkBitMap), p2i(_nextMarkBitMap)); |
|
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|
3473 _prevMarkBitMap->print_on_error(st, " Prev Bits: "); |
|
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|
3474 _nextMarkBitMap->print_on_error(st, " Next Bits: "); |
|
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|
3475 } |
|
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|
3476 |
| 342 | 3477 // We take a break if someone is trying to stop the world. |
|
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|
3478 bool ConcurrentMark::do_yield_check(uint worker_id) { |
| 20192 | 3479 if (SuspendibleThreadSet::should_yield()) { |
|
4728
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|
3480 if (worker_id == 0) { |
| 342 | 3481 _g1h->g1_policy()->record_concurrent_pause(); |
|
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|
3482 } |
| 20192 | 3483 SuspendibleThreadSet::yield(); |
| 342 | 3484 return true; |
| 3485 } else { | |
| 3486 return false; | |
| 3487 } | |
| 3488 } | |
| 3489 | |
| 3490 #ifndef PRODUCT | |
| 3491 // for debugging purposes | |
| 3492 void ConcurrentMark::print_finger() { | |
| 3493 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
|
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|
3494 p2i(_heap_start), p2i(_heap_end), p2i(_finger)); |
|
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|
3495 for (uint i = 0; i < _max_worker_id; ++i) { |
|
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|
3496 gclog_or_tty->print(" %u: " PTR_FORMAT, i, p2i(_tasks[i]->finger())); |
| 342 | 3497 } |
|
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|
3498 gclog_or_tty->cr(); |
| 342 | 3499 } |
| 3500 #endif | |
| 3501 | |
| 3771 | 3502 void CMTask::scan_object(oop obj) { |
| 3503 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
| 3504 | |
| 3505 if (_cm->verbose_high()) { | |
|
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|
3506 gclog_or_tty->print_cr("[%u] we're scanning object "PTR_FORMAT, |
|
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|
3507 _worker_id, p2i((void*) obj)); |
| 3771 | 3508 } |
| 3509 | |
| 3510 size_t obj_size = obj->size(); | |
| 3511 _words_scanned += obj_size; | |
| 3512 | |
| 3513 obj->oop_iterate(_cm_oop_closure); | |
| 3514 statsOnly( ++_objs_scanned ); | |
| 3515 check_limits(); | |
| 3516 } | |
| 3517 | |
| 342 | 3518 // Closure for iteration over bitmaps |
| 3519 class CMBitMapClosure : public BitMapClosure { | |
| 3520 private: | |
| 3521 // the bitmap that is being iterated over | |
| 3522 CMBitMap* _nextMarkBitMap; | |
| 3523 ConcurrentMark* _cm; | |
| 3524 CMTask* _task; | |
| 3525 | |
| 3526 public: | |
|
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|
3527 CMBitMapClosure(CMTask *task, ConcurrentMark* cm, CMBitMap* nextMarkBitMap) : |
|
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|
3528 _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } |
| 342 | 3529 |
| 3530 bool do_bit(size_t offset) { | |
| 3531 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
|
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|
3532 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
|
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|
3533 assert( addr < _cm->finger(), "invariant"); |
| 342 | 3534 |
|
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|
3535 statsOnly( _task->increase_objs_found_on_bitmap() ); |
|
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|
3536 assert(addr >= _task->finger(), "invariant"); |
|
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|
3537 |
|
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|
3538 // We move that task's local finger along. |
|
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|
3539 _task->move_finger_to(addr); |
| 342 | 3540 |
| 3541 _task->scan_object(oop(addr)); | |
| 3542 // we only partially drain the local queue and global stack | |
| 3543 _task->drain_local_queue(true); | |
| 3544 _task->drain_global_stack(true); | |
| 3545 | |
| 3546 // if the has_aborted flag has been raised, we need to bail out of | |
| 3547 // the iteration | |
| 3548 return !_task->has_aborted(); | |
| 3549 } | |
| 3550 }; | |
| 3551 | |
| 3771 | 3552 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
| 3553 ConcurrentMark* cm, | |
| 3554 CMTask* task) | |
| 3555 : _g1h(g1h), _cm(cm), _task(task) { | |
| 3556 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
| 3557 | |
| 3558 if (G1UseConcMarkReferenceProcessing) { | |
|
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changeset
|
3559 _ref_processor = g1h->ref_processor_cm(); |
| 3771 | 3560 assert(_ref_processor != NULL, "should not be NULL"); |
| 342 | 3561 } |
| 3771 | 3562 } |
| 342 | 3563 |
| 3564 void CMTask::setup_for_region(HeapRegion* hr) { | |
|
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|
3565 assert(hr != NULL, |
|
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changeset
|
3566 "claim_region() should have filtered out NULL regions"); |
|
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|
3567 assert(!hr->continuesHumongous(), |
|
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|
3568 "claim_region() should have filtered out continues humongous regions"); |
| 342 | 3569 |
|
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|
3570 if (_cm->verbose_low()) { |
|
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|
3571 gclog_or_tty->print_cr("[%u] setting up for region "PTR_FORMAT, |
|
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|
3572 _worker_id, p2i(hr)); |
|
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|
3573 } |
| 342 | 3574 |
| 3575 _curr_region = hr; | |
| 3576 _finger = hr->bottom(); | |
| 3577 update_region_limit(); | |
| 3578 } | |
| 3579 | |
| 3580 void CMTask::update_region_limit() { | |
| 3581 HeapRegion* hr = _curr_region; | |
| 3582 HeapWord* bottom = hr->bottom(); | |
| 3583 HeapWord* limit = hr->next_top_at_mark_start(); | |
| 3584 | |
| 3585 if (limit == bottom) { | |
|
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|
3586 if (_cm->verbose_low()) { |
|
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|
3587 gclog_or_tty->print_cr("[%u] found an empty region " |
| 342 | 3588 "["PTR_FORMAT", "PTR_FORMAT")", |
|
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|
3589 _worker_id, p2i(bottom), p2i(limit)); |
|
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|
3590 } |
| 342 | 3591 // The region was collected underneath our feet. |
| 3592 // We set the finger to bottom to ensure that the bitmap | |
| 3593 // iteration that will follow this will not do anything. | |
| 3594 // (this is not a condition that holds when we set the region up, | |
| 3595 // as the region is not supposed to be empty in the first place) | |
| 3596 _finger = bottom; | |
| 3597 } else if (limit >= _region_limit) { | |
|
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|
3598 assert(limit >= _finger, "peace of mind"); |
| 342 | 3599 } else { |
|
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|
3600 assert(limit < _region_limit, "only way to get here"); |
| 342 | 3601 // This can happen under some pretty unusual circumstances. An |
| 3602 // evacuation pause empties the region underneath our feet (NTAMS | |
| 3603 // at bottom). We then do some allocation in the region (NTAMS | |
| 3604 // stays at bottom), followed by the region being used as a GC | |
| 3605 // alloc region (NTAMS will move to top() and the objects | |
| 3606 // originally below it will be grayed). All objects now marked in | |
| 3607 // the region are explicitly grayed, if below the global finger, | |
| 3608 // and we do not need in fact to scan anything else. So, we simply | |
| 3609 // set _finger to be limit to ensure that the bitmap iteration | |
| 3610 // doesn't do anything. | |
| 3611 _finger = limit; | |
| 3612 } | |
| 3613 | |
| 3614 _region_limit = limit; | |
| 3615 } | |
| 3616 | |
| 3617 void CMTask::giveup_current_region() { | |
|
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|
3618 assert(_curr_region != NULL, "invariant"); |
|
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|
3619 if (_cm->verbose_low()) { |
|
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|
3620 gclog_or_tty->print_cr("[%u] giving up region "PTR_FORMAT, |
|
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|
3621 _worker_id, p2i(_curr_region)); |
|
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|
3622 } |
| 342 | 3623 clear_region_fields(); |
| 3624 } | |
| 3625 | |
| 3626 void CMTask::clear_region_fields() { | |
| 3627 // Values for these three fields that indicate that we're not | |
| 3628 // holding on to a region. | |
| 3629 _curr_region = NULL; | |
| 3630 _finger = NULL; | |
| 3631 _region_limit = NULL; | |
| 3632 } | |
| 3633 | |
| 3771 | 3634 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
| 3635 if (cm_oop_closure == NULL) { | |
| 3636 assert(_cm_oop_closure != NULL, "invariant"); | |
| 3637 } else { | |
| 3638 assert(_cm_oop_closure == NULL, "invariant"); | |
| 3639 } | |
| 3640 _cm_oop_closure = cm_oop_closure; | |
| 3641 } | |
| 3642 | |
| 342 | 3643 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
|
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|
3644 guarantee(nextMarkBitMap != NULL, "invariant"); |
| 342 | 3645 |
|
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|
3646 if (_cm->verbose_low()) { |
|
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|
3647 gclog_or_tty->print_cr("[%u] resetting", _worker_id); |
|
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|
3648 } |
| 342 | 3649 |
| 3650 _nextMarkBitMap = nextMarkBitMap; | |
| 3651 clear_region_fields(); | |
| 3652 | |
| 3653 _calls = 0; | |
| 3654 _elapsed_time_ms = 0.0; | |
| 3655 _termination_time_ms = 0.0; | |
| 3656 _termination_start_time_ms = 0.0; | |
| 3657 | |
| 3658 #if _MARKING_STATS_ | |
| 3659 _local_pushes = 0; | |
| 3660 _local_pops = 0; | |
| 3661 _local_max_size = 0; | |
| 3662 _objs_scanned = 0; | |
| 3663 _global_pushes = 0; | |
| 3664 _global_pops = 0; | |
| 3665 _global_max_size = 0; | |
| 3666 _global_transfers_to = 0; | |
| 3667 _global_transfers_from = 0; | |
| 3668 _regions_claimed = 0; | |
| 3669 _objs_found_on_bitmap = 0; | |
| 3670 _satb_buffers_processed = 0; | |
| 3671 _steal_attempts = 0; | |
| 3672 _steals = 0; | |
| 3673 _aborted = 0; | |
| 3674 _aborted_overflow = 0; | |
| 3675 _aborted_cm_aborted = 0; | |
| 3676 _aborted_yield = 0; | |
| 3677 _aborted_timed_out = 0; | |
| 3678 _aborted_satb = 0; | |
| 3679 _aborted_termination = 0; | |
| 3680 #endif // _MARKING_STATS_ | |
| 3681 } | |
| 3682 | |
| 3683 bool CMTask::should_exit_termination() { | |
| 3684 regular_clock_call(); | |
| 3685 // This is called when we are in the termination protocol. We should | |
| 3686 // quit if, for some reason, this task wants to abort or the global | |
| 3687 // stack is not empty (this means that we can get work from it). | |
| 3688 return !_cm->mark_stack_empty() || has_aborted(); | |
| 3689 } | |
| 3690 | |
| 3691 void CMTask::reached_limit() { | |
|
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3692 assert(_words_scanned >= _words_scanned_limit || |
|
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3693 _refs_reached >= _refs_reached_limit , |
|
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|
3694 "shouldn't have been called otherwise"); |
| 342 | 3695 regular_clock_call(); |
| 3696 } | |
| 3697 | |
| 3698 void CMTask::regular_clock_call() { | |
|
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|
3699 if (has_aborted()) return; |
| 342 | 3700 |
| 3701 // First, we need to recalculate the words scanned and refs reached | |
| 3702 // limits for the next clock call. | |
| 3703 recalculate_limits(); | |
| 3704 | |
| 3705 // During the regular clock call we do the following | |
| 3706 | |
| 3707 // (1) If an overflow has been flagged, then we abort. | |
| 3708 if (_cm->has_overflown()) { | |
| 3709 set_has_aborted(); | |
| 3710 return; | |
| 3711 } | |
| 3712 | |
| 3713 // If we are not concurrent (i.e. we're doing remark) we don't need | |
| 3714 // to check anything else. The other steps are only needed during | |
| 3715 // the concurrent marking phase. | |
|
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3716 if (!concurrent()) return; |
| 342 | 3717 |
| 3718 // (2) If marking has been aborted for Full GC, then we also abort. | |
| 3719 if (_cm->has_aborted()) { | |
| 3720 set_has_aborted(); | |
| 3721 statsOnly( ++_aborted_cm_aborted ); | |
| 3722 return; | |
| 3723 } | |
| 3724 | |
| 3725 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
| 3726 | |
| 3727 // (3) If marking stats are enabled, then we update the step history. | |
| 3728 #if _MARKING_STATS_ | |
|
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|
3729 if (_words_scanned >= _words_scanned_limit) { |
| 342 | 3730 ++_clock_due_to_scanning; |
|
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|
3731 } |
|
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|
3732 if (_refs_reached >= _refs_reached_limit) { |
| 342 | 3733 ++_clock_due_to_marking; |
|
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|
3734 } |
| 342 | 3735 |
| 3736 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
| 3737 _interval_start_time_ms = curr_time_ms; | |
| 3738 _all_clock_intervals_ms.add(last_interval_ms); | |
| 3739 | |
| 3740 if (_cm->verbose_medium()) { | |
|
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|
3741 gclog_or_tty->print_cr("[%u] regular clock, interval = %1.2lfms, " |
|
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3742 "scanned = "SIZE_FORMAT"%s, refs reached = "SIZE_FORMAT"%s", |
|
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3743 _worker_id, last_interval_ms, |
|
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3744 _words_scanned, |
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|
3745 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
|
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3746 _refs_reached, |
|
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|
3747 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
| 342 | 3748 } |
| 3749 #endif // _MARKING_STATS_ | |
| 3750 | |
| 3751 // (4) We check whether we should yield. If we have to, then we abort. | |
| 20192 | 3752 if (SuspendibleThreadSet::should_yield()) { |
| 342 | 3753 // We should yield. To do this we abort the task. The caller is |
| 3754 // responsible for yielding. | |
| 3755 set_has_aborted(); | |
| 3756 statsOnly( ++_aborted_yield ); | |
| 3757 return; | |
| 3758 } | |
| 3759 | |
| 3760 // (5) We check whether we've reached our time quota. If we have, | |
| 3761 // then we abort. | |
| 3762 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
| 3763 if (elapsed_time_ms > _time_target_ms) { | |
| 3764 set_has_aborted(); | |
|
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|
3765 _has_timed_out = true; |
| 342 | 3766 statsOnly( ++_aborted_timed_out ); |
| 3767 return; | |
| 3768 } | |
| 3769 | |
| 3770 // (6) Finally, we check whether there are enough completed STAB | |
| 3771 // buffers available for processing. If there are, we abort. | |
| 3772 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3773 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
|
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|
3774 if (_cm->verbose_low()) { |
|
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3775 gclog_or_tty->print_cr("[%u] aborting to deal with pending SATB buffers", |
|
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|
3776 _worker_id); |
|
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|
3777 } |
| 342 | 3778 // we do need to process SATB buffers, we'll abort and restart |
| 3779 // the marking task to do so | |
| 3780 set_has_aborted(); | |
| 3781 statsOnly( ++_aborted_satb ); | |
| 3782 return; | |
| 3783 } | |
| 3784 } | |
| 3785 | |
| 3786 void CMTask::recalculate_limits() { | |
| 3787 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
| 3788 _words_scanned_limit = _real_words_scanned_limit; | |
| 3789 | |
| 3790 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
| 3791 _refs_reached_limit = _real_refs_reached_limit; | |
| 3792 } | |
| 3793 | |
| 3794 void CMTask::decrease_limits() { | |
| 3795 // This is called when we believe that we're going to do an infrequent | |
| 3796 // operation which will increase the per byte scanned cost (i.e. move | |
| 3797 // entries to/from the global stack). It basically tries to decrease the | |
| 3798 // scanning limit so that the clock is called earlier. | |
| 3799 | |
|
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|
3800 if (_cm->verbose_medium()) { |
|
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3801 gclog_or_tty->print_cr("[%u] decreasing limits", _worker_id); |
|
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|
3802 } |
| 342 | 3803 |
| 3804 _words_scanned_limit = _real_words_scanned_limit - | |
| 3805 3 * words_scanned_period / 4; | |
| 3806 _refs_reached_limit = _real_refs_reached_limit - | |
| 3807 3 * refs_reached_period / 4; | |
| 3808 } | |
| 3809 | |
| 3810 void CMTask::move_entries_to_global_stack() { | |
| 3811 // local array where we'll store the entries that will be popped | |
| 3812 // from the local queue | |
| 3813 oop buffer[global_stack_transfer_size]; | |
| 3814 | |
| 3815 int n = 0; | |
| 3816 oop obj; | |
| 3817 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
| 3818 buffer[n] = obj; | |
| 3819 ++n; | |
| 3820 } | |
| 3821 | |
| 3822 if (n > 0) { | |
| 3823 // we popped at least one entry from the local queue | |
| 3824 | |
| 3825 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
| 3826 | |
| 3827 if (!_cm->mark_stack_push(buffer, n)) { | |
|
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|
3828 if (_cm->verbose_low()) { |
|
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|
3829 gclog_or_tty->print_cr("[%u] aborting due to global stack overflow", |
|
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|
3830 _worker_id); |
|
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|
3831 } |
| 342 | 3832 set_has_aborted(); |
| 3833 } else { | |
| 3834 // the transfer was successful | |
| 3835 | |
|
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|
3836 if (_cm->verbose_medium()) { |
|
6862
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|
3837 gclog_or_tty->print_cr("[%u] pushed %d entries to the global stack", |
|
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|
3838 _worker_id, n); |
|
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|
3839 } |
| 342 | 3840 statsOnly( int tmp_size = _cm->mark_stack_size(); |
|
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|
3841 if (tmp_size > _global_max_size) { |
| 342 | 3842 _global_max_size = tmp_size; |
|
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|
3843 } |
| 342 | 3844 _global_pushes += n ); |
| 3845 } | |
| 3846 } | |
| 3847 | |
| 3848 // this operation was quite expensive, so decrease the limits | |
| 3849 decrease_limits(); | |
| 3850 } | |
| 3851 | |
| 3852 void CMTask::get_entries_from_global_stack() { | |
| 3853 // local array where we'll store the entries that will be popped | |
| 3854 // from the global stack. | |
| 3855 oop buffer[global_stack_transfer_size]; | |
| 3856 int n; | |
| 3857 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
|
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|
3858 assert(n <= global_stack_transfer_size, |
|
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|
3859 "we should not pop more than the given limit"); |
| 342 | 3860 if (n > 0) { |
| 3861 // yes, we did actually pop at least one entry | |
| 3862 | |
| 3863 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
|
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|
3864 if (_cm->verbose_medium()) { |
|
6862
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|
3865 gclog_or_tty->print_cr("[%u] popped %d entries from the global stack", |
|
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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|
3866 _worker_id, n); |
|
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|
3867 } |
| 342 | 3868 for (int i = 0; i < n; ++i) { |
| 3869 bool success = _task_queue->push(buffer[i]); | |
| 3870 // We only call this when the local queue is empty or under a | |
| 3871 // given target limit. So, we do not expect this push to fail. | |
|
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|
3872 assert(success, "invariant"); |
| 342 | 3873 } |
| 3874 | |
| 3875 statsOnly( int tmp_size = _task_queue->size(); | |
|
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|
3876 if (tmp_size > _local_max_size) { |
| 342 | 3877 _local_max_size = tmp_size; |
|
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|
3878 } |
| 342 | 3879 _local_pushes += n ); |
| 3880 } | |
| 3881 | |
| 3882 // this operation was quite expensive, so decrease the limits | |
| 3883 decrease_limits(); | |
| 3884 } | |
| 3885 | |
| 3886 void CMTask::drain_local_queue(bool partially) { | |
|
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|
3887 if (has_aborted()) return; |
| 342 | 3888 |
| 3889 // Decide what the target size is, depending whether we're going to | |
| 3890 // drain it partially (so that other tasks can steal if they run out | |
| 3891 // of things to do) or totally (at the very end). | |
| 3892 size_t target_size; | |
|
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|
3893 if (partially) { |
| 342 | 3894 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
|
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|
3895 } else { |
| 342 | 3896 target_size = 0; |
|
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|
3897 } |
| 342 | 3898 |
| 3899 if (_task_queue->size() > target_size) { | |
|
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|
3900 if (_cm->verbose_high()) { |
|
17937
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|
3901 gclog_or_tty->print_cr("[%u] draining local queue, target size = " SIZE_FORMAT, |
|
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|
3902 _worker_id, target_size); |
|
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|
3903 } |
| 342 | 3904 |
| 3905 oop obj; | |
| 3906 bool ret = _task_queue->pop_local(obj); | |
| 3907 while (ret) { | |
| 3908 statsOnly( ++_local_pops ); | |
| 3909 | |
|
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|
3910 if (_cm->verbose_high()) { |
|
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|
3911 gclog_or_tty->print_cr("[%u] popped "PTR_FORMAT, _worker_id, |
|
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|
3912 p2i((void*) obj)); |
|
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|
3913 } |
| 342 | 3914 |
|
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|
3915 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
| 2361 | 3916 assert(!_g1h->is_on_master_free_list( |
| 2152 | 3917 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
| 342 | 3918 |
| 3919 scan_object(obj); | |
| 3920 | |
|
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|
3921 if (_task_queue->size() <= target_size || has_aborted()) { |
| 342 | 3922 ret = false; |
|
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|
3923 } else { |
| 342 | 3924 ret = _task_queue->pop_local(obj); |
|
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|
3925 } |
| 342 | 3926 } |
| 3927 | |
|
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changeset
|
3928 if (_cm->verbose_high()) { |
|
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|
3929 gclog_or_tty->print_cr("[%u] drained local queue, size = %d", |
|
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|
3930 _worker_id, _task_queue->size()); |
|
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|
3931 } |
| 342 | 3932 } |
| 3933 } | |
| 3934 | |
| 3935 void CMTask::drain_global_stack(bool partially) { | |
|
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|
3936 if (has_aborted()) return; |
| 342 | 3937 |
| 3938 // We have a policy to drain the local queue before we attempt to | |
| 3939 // drain the global stack. | |
|
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|
3940 assert(partially || _task_queue->size() == 0, "invariant"); |
| 342 | 3941 |
| 3942 // Decide what the target size is, depending whether we're going to | |
| 3943 // drain it partially (so that other tasks can steal if they run out | |
| 3944 // of things to do) or totally (at the very end). Notice that, | |
| 3945 // because we move entries from the global stack in chunks or | |
| 3946 // because another task might be doing the same, we might in fact | |
| 3947 // drop below the target. But, this is not a problem. | |
| 3948 size_t target_size; | |
|
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|
3949 if (partially) { |
| 342 | 3950 target_size = _cm->partial_mark_stack_size_target(); |
|
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|
3951 } else { |
| 342 | 3952 target_size = 0; |
|
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3953 } |
| 342 | 3954 |
| 3955 if (_cm->mark_stack_size() > target_size) { | |
|
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3956 if (_cm->verbose_low()) { |
|
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3957 gclog_or_tty->print_cr("[%u] draining global_stack, target size " SIZE_FORMAT, |
|
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3958 _worker_id, target_size); |
|
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3959 } |
| 342 | 3960 |
| 3961 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
| 3962 get_entries_from_global_stack(); | |
| 3963 drain_local_queue(partially); | |
| 3964 } | |
| 3965 | |
|
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3966 if (_cm->verbose_low()) { |
|
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3967 gclog_or_tty->print_cr("[%u] drained global stack, size = " SIZE_FORMAT, |
|
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3968 _worker_id, _cm->mark_stack_size()); |
|
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3969 } |
| 342 | 3970 } |
| 3971 } | |
| 3972 | |
| 3973 // SATB Queue has several assumptions on whether to call the par or | |
| 3974 // non-par versions of the methods. this is why some of the code is | |
| 3975 // replicated. We should really get rid of the single-threaded version | |
| 3976 // of the code to simplify things. | |
| 3977 void CMTask::drain_satb_buffers() { | |
|
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3978 if (has_aborted()) return; |
| 342 | 3979 |
| 3980 // We set this so that the regular clock knows that we're in the | |
| 3981 // middle of draining buffers and doesn't set the abort flag when it | |
| 3982 // notices that SATB buffers are available for draining. It'd be | |
| 3983 // very counter productive if it did that. :-) | |
| 3984 _draining_satb_buffers = true; | |
| 3985 | |
| 3986 CMObjectClosure oc(this); | |
| 3987 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
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3988 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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3989 satb_mq_set.set_par_closure(_worker_id, &oc); |
|
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3990 } else { |
| 342 | 3991 satb_mq_set.set_closure(&oc); |
|
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3992 } |
| 342 | 3993 |
| 3994 // This keeps claiming and applying the closure to completed buffers | |
| 3995 // until we run out of buffers or we need to abort. | |
|
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3996 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 3997 while (!has_aborted() && |
|
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3998 satb_mq_set.par_apply_closure_to_completed_buffer(_worker_id)) { |
|
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3999 if (_cm->verbose_medium()) { |
|
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4000 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
|
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4001 } |
| 342 | 4002 statsOnly( ++_satb_buffers_processed ); |
| 4003 regular_clock_call(); | |
| 4004 } | |
| 4005 } else { | |
| 4006 while (!has_aborted() && | |
| 4007 satb_mq_set.apply_closure_to_completed_buffer()) { | |
|
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4008 if (_cm->verbose_medium()) { |
|
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4009 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
|
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4010 } |
| 342 | 4011 statsOnly( ++_satb_buffers_processed ); |
| 4012 regular_clock_call(); | |
| 4013 } | |
| 4014 } | |
| 4015 | |
| 4016 _draining_satb_buffers = false; | |
| 4017 | |
|
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4018 assert(has_aborted() || |
|
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4019 concurrent() || |
|
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4020 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 4021 |
|
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4022 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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4023 satb_mq_set.set_par_closure(_worker_id, NULL); |
|
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4024 } else { |
| 342 | 4025 satb_mq_set.set_closure(NULL); |
|
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4026 } |
| 342 | 4027 |
| 4028 // again, this was a potentially expensive operation, decrease the | |
| 4029 // limits to get the regular clock call early | |
| 4030 decrease_limits(); | |
| 4031 } | |
| 4032 | |
| 4033 void CMTask::print_stats() { | |
|
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4034 gclog_or_tty->print_cr("Marking Stats, task = %u, calls = %d", |
|
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4035 _worker_id, _calls); |
| 342 | 4036 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", |
| 4037 _elapsed_time_ms, _termination_time_ms); | |
| 4038 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 4039 _step_times_ms.num(), _step_times_ms.avg(), | |
| 4040 _step_times_ms.sd()); | |
| 4041 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 4042 _step_times_ms.maximum(), _step_times_ms.sum()); | |
| 4043 | |
| 4044 #if _MARKING_STATS_ | |
| 4045 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 4046 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
| 4047 _all_clock_intervals_ms.sd()); | |
| 4048 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 4049 _all_clock_intervals_ms.maximum(), | |
| 4050 _all_clock_intervals_ms.sum()); | |
| 4051 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
| 4052 _clock_due_to_scanning, _clock_due_to_marking); | |
| 4053 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
| 4054 _objs_scanned, _objs_found_on_bitmap); | |
| 4055 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
| 4056 _local_pushes, _local_pops, _local_max_size); | |
| 4057 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
| 4058 _global_pushes, _global_pops, _global_max_size); | |
| 4059 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
| 4060 _global_transfers_to,_global_transfers_from); | |
|
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4061 gclog_or_tty->print_cr(" Regions: claimed = %d", _regions_claimed); |
| 342 | 4062 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); |
| 4063 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
| 4064 _steal_attempts, _steals); | |
| 4065 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
| 4066 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
| 4067 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
| 4068 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
| 4069 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
| 4070 #endif // _MARKING_STATS_ | |
| 4071 } | |
| 4072 | |
| 4073 /***************************************************************************** | |
| 4074 | |
|
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4075 The do_marking_step(time_target_ms, ...) method is the building |
|
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4076 block of the parallel marking framework. It can be called in parallel |
| 342 | 4077 with other invocations of do_marking_step() on different tasks |
| 4078 (but only one per task, obviously) and concurrently with the | |
| 4079 mutator threads, or during remark, hence it eliminates the need | |
| 4080 for two versions of the code. When called during remark, it will | |
| 4081 pick up from where the task left off during the concurrent marking | |
| 4082 phase. Interestingly, tasks are also claimable during evacuation | |
| 4083 pauses too, since do_marking_step() ensures that it aborts before | |
| 4084 it needs to yield. | |
| 4085 | |
|
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4086 The data structures that it uses to do marking work are the |
| 342 | 4087 following: |
| 4088 | |
| 4089 (1) Marking Bitmap. If there are gray objects that appear only | |
| 4090 on the bitmap (this happens either when dealing with an overflow | |
| 4091 or when the initial marking phase has simply marked the roots | |
| 4092 and didn't push them on the stack), then tasks claim heap | |
| 4093 regions whose bitmap they then scan to find gray objects. A | |
| 4094 global finger indicates where the end of the last claimed region | |
| 4095 is. A local finger indicates how far into the region a task has | |
| 4096 scanned. The two fingers are used to determine how to gray an | |
| 4097 object (i.e. whether simply marking it is OK, as it will be | |
| 4098 visited by a task in the future, or whether it needs to be also | |
| 4099 pushed on a stack). | |
| 4100 | |
| 4101 (2) Local Queue. The local queue of the task which is accessed | |
| 4102 reasonably efficiently by the task. Other tasks can steal from | |
| 4103 it when they run out of work. Throughout the marking phase, a | |
| 4104 task attempts to keep its local queue short but not totally | |
| 4105 empty, so that entries are available for stealing by other | |
| 4106 tasks. Only when there is no more work, a task will totally | |
| 4107 drain its local queue. | |
| 4108 | |
| 4109 (3) Global Mark Stack. This handles local queue overflow. During | |
| 4110 marking only sets of entries are moved between it and the local | |
| 4111 queues, as access to it requires a mutex and more fine-grain | |
| 4112 interaction with it which might cause contention. If it | |
| 4113 overflows, then the marking phase should restart and iterate | |
| 4114 over the bitmap to identify gray objects. Throughout the marking | |
| 4115 phase, tasks attempt to keep the global mark stack at a small | |
| 4116 length but not totally empty, so that entries are available for | |
| 4117 popping by other tasks. Only when there is no more work, tasks | |
| 4118 will totally drain the global mark stack. | |
| 4119 | |
|
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4120 (4) SATB Buffer Queue. This is where completed SATB buffers are |
| 342 | 4121 made available. Buffers are regularly removed from this queue |
| 4122 and scanned for roots, so that the queue doesn't get too | |
| 4123 long. During remark, all completed buffers are processed, as | |
| 4124 well as the filled in parts of any uncompleted buffers. | |
| 4125 | |
| 4126 The do_marking_step() method tries to abort when the time target | |
| 4127 has been reached. There are a few other cases when the | |
| 4128 do_marking_step() method also aborts: | |
| 4129 | |
| 4130 (1) When the marking phase has been aborted (after a Full GC). | |
| 4131 | |
|
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4132 (2) When a global overflow (on the global stack) has been |
|
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4133 triggered. Before the task aborts, it will actually sync up with |
|
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|
4134 the other tasks to ensure that all the marking data structures |
|
8788
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4135 (local queues, stacks, fingers etc.) are re-initialized so that |
|
5988
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|
4136 when do_marking_step() completes, the marking phase can |
|
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4137 immediately restart. |
| 342 | 4138 |
| 4139 (3) When enough completed SATB buffers are available. The | |
| 4140 do_marking_step() method only tries to drain SATB buffers right | |
| 4141 at the beginning. So, if enough buffers are available, the | |
| 4142 marking step aborts and the SATB buffers are processed at | |
| 4143 the beginning of the next invocation. | |
| 4144 | |
| 4145 (4) To yield. when we have to yield then we abort and yield | |
| 4146 right at the end of do_marking_step(). This saves us from a lot | |
| 4147 of hassle as, by yielding we might allow a Full GC. If this | |
| 4148 happens then objects will be compacted underneath our feet, the | |
| 4149 heap might shrink, etc. We save checking for this by just | |
| 4150 aborting and doing the yield right at the end. | |
| 4151 | |
| 4152 From the above it follows that the do_marking_step() method should | |
| 4153 be called in a loop (or, otherwise, regularly) until it completes. | |
| 4154 | |
| 4155 If a marking step completes without its has_aborted() flag being | |
| 4156 true, it means it has completed the current marking phase (and | |
| 4157 also all other marking tasks have done so and have all synced up). | |
| 4158 | |
| 4159 A method called regular_clock_call() is invoked "regularly" (in | |
| 4160 sub ms intervals) throughout marking. It is this clock method that | |
| 4161 checks all the abort conditions which were mentioned above and | |
| 4162 decides when the task should abort. A work-based scheme is used to | |
| 4163 trigger this clock method: when the number of object words the | |
| 4164 marking phase has scanned or the number of references the marking | |
| 4165 phase has visited reach a given limit. Additional invocations to | |
| 4166 the method clock have been planted in a few other strategic places | |
| 4167 too. The initial reason for the clock method was to avoid calling | |
| 4168 vtime too regularly, as it is quite expensive. So, once it was in | |
| 4169 place, it was natural to piggy-back all the other conditions on it | |
| 4170 too and not constantly check them throughout the code. | |
| 4171 | |
|
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4172 If do_termination is true then do_marking_step will enter its |
|
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4173 termination protocol. |
|
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4174 |
|
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4175 The value of is_serial must be true when do_marking_step is being |
|
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4176 called serially (i.e. by the VMThread) and do_marking_step should |
|
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4177 skip any synchronization in the termination and overflow code. |
|
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4178 Examples include the serial remark code and the serial reference |
|
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|
4179 processing closures. |
|
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4180 |
|
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4181 The value of is_serial must be false when do_marking_step is |
|
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4182 being called by any of the worker threads in a work gang. |
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4183 Examples include the concurrent marking code (CMMarkingTask), |
|
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4184 the MT remark code, and the MT reference processing closures. |
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4185 |
| 342 | 4186 *****************************************************************************/ |
| 4187 | |
|
2174
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|
4188 void CMTask::do_marking_step(double time_target_ms, |
|
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4189 bool do_termination, |
|
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|
4190 bool is_serial) { |
|
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4191 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
|
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4192 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
|
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4193 |
| 342 | 4194 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); |
|
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4195 assert(_task_queues != NULL, "invariant"); |
|
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4196 assert(_task_queue != NULL, "invariant"); |
|
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4197 assert(_task_queues->queue(_worker_id) == _task_queue, "invariant"); |
|
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4198 |
|
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4199 assert(!_claimed, |
|
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|
4200 "only one thread should claim this task at any one time"); |
| 342 | 4201 |
| 4202 // OK, this doesn't safeguard again all possible scenarios, as it is | |
| 4203 // possible for two threads to set the _claimed flag at the same | |
| 4204 // time. But it is only for debugging purposes anyway and it will | |
| 4205 // catch most problems. | |
| 4206 _claimed = true; | |
| 4207 | |
| 4208 _start_time_ms = os::elapsedVTime() * 1000.0; | |
| 4209 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
| 4210 | |
|
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|
4211 // If do_stealing is true then do_marking_step will attempt to |
|
fa08949fe0cb
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|
4212 // steal work from the other CMTasks. It only makes sense to |
|
fa08949fe0cb
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|
4213 // enable stealing when the termination protocol is enabled |
|
fa08949fe0cb
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|
4214 // and do_marking_step() is not being called serially. |
|
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|
4215 bool do_stealing = do_termination && !is_serial; |
|
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|
4216 |
| 342 | 4217 double diff_prediction_ms = |
| 4218 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
| 4219 _time_target_ms = time_target_ms - diff_prediction_ms; | |
| 4220 | |
| 4221 // set up the variables that are used in the work-based scheme to | |
| 4222 // call the regular clock method | |
| 4223 _words_scanned = 0; | |
| 4224 _refs_reached = 0; | |
| 4225 recalculate_limits(); | |
| 4226 | |
| 4227 // clear all flags | |
| 4228 clear_has_aborted(); | |
|
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|
4229 _has_timed_out = false; |
| 342 | 4230 _draining_satb_buffers = false; |
| 4231 | |
| 4232 ++_calls; | |
| 4233 | |
|
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|
4234 if (_cm->verbose_low()) { |
|
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|
4235 gclog_or_tty->print_cr("[%u] >>>>>>>>>> START, call = %d, " |
| 342 | 4236 "target = %1.2lfms >>>>>>>>>>", |
|
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|
4237 _worker_id, _calls, _time_target_ms); |
|
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|
4238 } |
| 342 | 4239 |
| 4240 // Set up the bitmap and oop closures. Anything that uses them is | |
| 4241 // eventually called from this method, so it is OK to allocate these | |
| 4242 // statically. | |
| 4243 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
| 3771 | 4244 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
| 4245 set_cm_oop_closure(&cm_oop_closure); | |
| 342 | 4246 |
| 4247 if (_cm->has_overflown()) { | |
|
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|
4248 // This can happen if the mark stack overflows during a GC pause |
|
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|
4249 // and this task, after a yield point, restarts. We have to abort |
|
2a0172480595
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|
4250 // as we need to get into the overflow protocol which happens |
|
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|
4251 // right at the end of this task. |
| 342 | 4252 set_has_aborted(); |
| 4253 } | |
| 4254 | |
| 4255 // First drain any available SATB buffers. After this, we will not | |
| 4256 // look at SATB buffers before the next invocation of this method. | |
| 4257 // If enough completed SATB buffers are queued up, the regular clock | |
| 4258 // will abort this task so that it restarts. | |
| 4259 drain_satb_buffers(); | |
| 4260 // ...then partially drain the local queue and the global stack | |
| 4261 drain_local_queue(true); | |
| 4262 drain_global_stack(true); | |
| 4263 | |
| 4264 do { | |
| 4265 if (!has_aborted() && _curr_region != NULL) { | |
| 4266 // This means that we're already holding on to a region. | |
|
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|
4267 assert(_finger != NULL, "if region is not NULL, then the finger " |
|
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|
4268 "should not be NULL either"); |
| 342 | 4269 |
| 4270 // We might have restarted this task after an evacuation pause | |
| 4271 // which might have evacuated the region we're holding on to | |
| 4272 // underneath our feet. Let's read its limit again to make sure | |
| 4273 // that we do not iterate over a region of the heap that | |
| 4274 // contains garbage (update_region_limit() will also move | |
| 4275 // _finger to the start of the region if it is found empty). | |
| 4276 update_region_limit(); | |
| 4277 // We will start from _finger not from the start of the region, | |
| 4278 // as we might be restarting this task after aborting half-way | |
| 4279 // through scanning this region. In this case, _finger points to | |
| 4280 // the address where we last found a marked object. If this is a | |
| 4281 // fresh region, _finger points to start(). | |
| 4282 MemRegion mr = MemRegion(_finger, _region_limit); | |
| 4283 | |
|
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|
4284 if (_cm->verbose_low()) { |
|
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|
4285 gclog_or_tty->print_cr("[%u] we're scanning part " |
| 342 | 4286 "["PTR_FORMAT", "PTR_FORMAT") " |
|
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|
4287 "of region "HR_FORMAT, |
|
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|
4288 _worker_id, p2i(_finger), p2i(_region_limit), |
|
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|
4289 HR_FORMAT_PARAMS(_curr_region)); |
|
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|
4290 } |
| 342 | 4291 |
|
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|
4292 assert(!_curr_region->isHumongous() || mr.start() == _curr_region->bottom(), |
|
5e401ef52ec0
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|
4293 "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
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|
4294 |
|
5e401ef52ec0
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|
4295 // Some special cases: |
|
5e401ef52ec0
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|
4296 // 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
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|
4297 // If the current region is humongous then we only need to check |
|
5e401ef52ec0
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|
4298 // the bitmap for the bit associated with the start of the object, |
|
5e401ef52ec0
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|
4299 // scan the object if it's live, and give up the region. |
|
5e401ef52ec0
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|
4300 // 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
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|
4301 // that is left. |
|
8034
bce1ac447f6b
7052429: G1: Avoid unnecessary scanning of humongous regions during concurrent marking
johnc
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diff
changeset
|
4302 // 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
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|
4303 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
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|
4304 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
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|
4305 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
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|
4306 } else if (_curr_region->isHumongous() && mr.start() == _curr_region->bottom()) { |
|
5e401ef52ec0
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|
4307 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
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|
4308 // 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
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|
4309 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
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|
4310 bitmap_closure.do_bit(offset); |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4311 } |
|
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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|
4312 // 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
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|
4313 // 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
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|
4314 giveup_current_region(); |
|
5e401ef52ec0
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|
4315 regular_clock_call(); |
|
5e401ef52ec0
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|
4316 } else if (_nextMarkBitMap->iterate(&bitmap_closure, mr)) { |
| 342 | 4317 giveup_current_region(); |
| 4318 regular_clock_call(); | |
| 4319 } else { | |
|
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|
4320 assert(has_aborted(), "currently the only way to do so"); |
| 342 | 4321 // The only way to abort the bitmap iteration is to return |
| 4322 // false from the do_bit() method. However, inside the | |
| 4323 // do_bit() method we move the _finger to point to the | |
| 4324 // object currently being looked at. So, if we bail out, we | |
| 4325 // have definitely set _finger to something non-null. | |
|
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|
4326 assert(_finger != NULL, "invariant"); |
| 342 | 4327 |
| 4328 // Region iteration was actually aborted. So now _finger | |
| 4329 // points to the address of the object we last scanned. If we | |
| 4330 // leave it there, when we restart this task, we will rescan | |
| 4331 // the object. It is easy to avoid this. We move the finger by | |
| 4332 // enough to point to the next possible object header (the | |
| 4333 // bitmap knows by how much we need to move it as it knows its | |
| 4334 // granularity). | |
|
1314
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
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|
4335 assert(_finger < _region_limit, "invariant"); |
|
8733
9def4075da6d
8008079: G1: Add nextObject routine to CMBitMapRO and replace nextWord
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|
4336 HeapWord* new_finger = _nextMarkBitMap->nextObject(_finger); |
|
1314
3f0549ed0c98
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apetrusenko
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diff
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|
4337 // Check if bitmap iteration was aborted while scanning the last object |
|
3f0549ed0c98
6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant")
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|
4338 if (new_finger >= _region_limit) { |
|
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|
4339 giveup_current_region(); |
|
1314
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|
4340 } else { |
|
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|
4341 move_finger_to(new_finger); |
|
1314
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|
4342 } |
| 342 | 4343 } |
| 4344 } | |
| 4345 // At this point we have either completed iterating over the | |
| 4346 // region we were holding on to, or we have aborted. | |
| 4347 | |
| 4348 // We then partially drain the local queue and the global stack. | |
| 4349 // (Do we really need this?) | |
| 4350 drain_local_queue(true); | |
| 4351 drain_global_stack(true); | |
| 4352 | |
| 4353 // Read the note on the claim_region() method on why it might | |
| 4354 // return NULL with potentially more regions available for | |
| 4355 // claiming and why we have to check out_of_regions() to determine | |
| 4356 // whether we're done or not. | |
| 4357 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
| 4358 // We are going to try to claim a new region. We should have | |
| 4359 // given up on the previous one. | |
|
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|
4360 // Separated the asserts so that we know which one fires. |
|
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|
4361 assert(_curr_region == NULL, "invariant"); |
|
11d4857fe5e1
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|
4362 assert(_finger == NULL, "invariant"); |
|
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|
4363 assert(_region_limit == NULL, "invariant"); |
|
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|
4364 if (_cm->verbose_low()) { |
|
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|
4365 gclog_or_tty->print_cr("[%u] trying to claim a new region", _worker_id); |
|
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|
4366 } |
|
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|
4367 HeapRegion* claimed_region = _cm->claim_region(_worker_id); |
| 342 | 4368 if (claimed_region != NULL) { |
| 4369 // Yes, we managed to claim one | |
| 4370 statsOnly( ++_regions_claimed ); | |
| 4371 | |
|
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|
4372 if (_cm->verbose_low()) { |
|
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|
4373 gclog_or_tty->print_cr("[%u] we successfully claimed " |
| 342 | 4374 "region "PTR_FORMAT, |
|
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|
4375 _worker_id, p2i(claimed_region)); |
|
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|
4376 } |
| 342 | 4377 |
| 4378 setup_for_region(claimed_region); | |
|
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|
4379 assert(_curr_region == claimed_region, "invariant"); |
| 342 | 4380 } |
| 4381 // It is important to call the regular clock here. It might take | |
| 4382 // a while to claim a region if, for example, we hit a large | |
| 4383 // block of empty regions. So we need to call the regular clock | |
| 4384 // method once round the loop to make sure it's called | |
| 4385 // frequently enough. | |
| 4386 regular_clock_call(); | |
| 4387 } | |
| 4388 | |
| 4389 if (!has_aborted() && _curr_region == NULL) { | |
|
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|
4390 assert(_cm->out_of_regions(), |
|
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|
4391 "at this point we should be out of regions"); |
| 342 | 4392 } |
| 4393 } while ( _curr_region != NULL && !has_aborted()); | |
| 4394 | |
| 4395 if (!has_aborted()) { | |
| 4396 // We cannot check whether the global stack is empty, since other | |
|
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|
4397 // tasks might be pushing objects to it concurrently. |
|
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|
4398 assert(_cm->out_of_regions(), |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
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|
4399 "at this point we should be out of regions"); |
| 342 | 4400 |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
changeset
|
4401 if (_cm->verbose_low()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4402 gclog_or_tty->print_cr("[%u] all regions claimed", _worker_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
changeset
|
4403 } |
| 342 | 4404 |
| 4405 // Try to reduce the number of available SATB buffers so that | |
| 4406 // remark has less work to do. | |
| 4407 drain_satb_buffers(); | |
| 4408 } | |
| 4409 | |
| 4410 // Since we've done everything else, we can now totally drain the | |
| 4411 // local queue and global stack. | |
| 4412 drain_local_queue(false); | |
| 4413 drain_global_stack(false); | |
| 4414 | |
| 4415 // Attempt at work stealing from other task's queues. | |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
4416 if (do_stealing && !has_aborted()) { |
| 342 | 4417 // We have not aborted. This means that we have finished all that |
| 4418 // we could. Let's try to do some stealing... | |
| 4419 | |
| 4420 // 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
|
4421 // tasks might be pushing objects to it concurrently. |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4422 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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diff
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|
4423 "only way to reach here"); |
| 342 | 4424 |
|
3776
23d434c6290d
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diff
changeset
|
4425 if (_cm->verbose_low()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4426 gclog_or_tty->print_cr("[%u] starting to steal", _worker_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
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diff
changeset
|
4427 } |
| 342 | 4428 |
| 4429 while (!has_aborted()) { | |
| 4430 oop obj; | |
| 4431 statsOnly( ++_steal_attempts ); | |
| 4432 | |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
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|
4433 if (_cm->try_stealing(_worker_id, &_hash_seed, obj)) { |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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diff
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|
4434 if (_cm->verbose_medium()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4435 gclog_or_tty->print_cr("[%u] stolen "PTR_FORMAT" successfully", |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
4436 _worker_id, p2i((void*) obj)); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
changeset
|
4437 } |
| 342 | 4438 |
| 4439 statsOnly( ++_steals ); | |
| 4440 | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
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diff
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|
4441 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
|
11d4857fe5e1
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diff
changeset
|
4442 "any stolen object should be marked"); |
| 342 | 4443 scan_object(obj); |
| 4444 | |
| 4445 // And since we're towards the end, let's totally drain the | |
| 4446 // local queue and global stack. | |
| 4447 drain_local_queue(false); | |
| 4448 drain_global_stack(false); | |
| 4449 } else { | |
| 4450 break; | |
| 4451 } | |
| 4452 } | |
| 4453 } | |
| 4454 | |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4455 // 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
|
4456 // 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
|
4457 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
|
4458 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
|
4459 _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
|
4460 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
|
4461 } |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4462 } |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
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2436
diff
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|
4463 |
| 342 | 4464 // We still haven't aborted. Now, let's try to get into the |
| 4465 // termination protocol. | |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
4466 if (do_termination && !has_aborted()) { |
| 342 | 4467 // We cannot check whether the global stack is empty, since other |
|
5988
2a0172480595
7127697: G1: remove dead code after recent concurrent mark changes
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parents:
4837
diff
changeset
|
4468 // tasks might be concurrently pushing objects on it. |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4469 // Separated the asserts so that we know which one fires. |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4470 assert(_cm->out_of_regions(), "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4471 assert(_task_queue->size() == 0, "only way to reach here"); |
| 342 | 4472 |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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diff
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|
4473 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
changeset
|
4474 gclog_or_tty->print_cr("[%u] starting termination protocol", _worker_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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diff
changeset
|
4475 } |
| 342 | 4476 |
| 4477 _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
changeset
|
4478 |
| 342 | 4479 // The CMTask class also extends the TerminatorTerminator class, |
| 4480 // hence its should_exit_termination() method will also decide | |
| 4481 // 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
|
4482 bool finished = (is_serial || |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4483 _cm->terminator()->offer_termination(this)); |
| 342 | 4484 double termination_end_time_ms = os::elapsedVTime() * 1000.0; |
| 4485 _termination_time_ms += | |
| 4486 termination_end_time_ms - _termination_start_time_ms; | |
| 4487 | |
| 4488 if (finished) { | |
| 4489 // We're all done. | |
| 4490 | |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
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diff
changeset
|
4491 if (_worker_id == 0) { |
| 342 | 4492 // let's allow task 0 to do this |
| 4493 if (concurrent()) { | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4494 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
| 342 | 4495 // we need to set this to false before the next |
| 4496 // safepoint. This way we ensure that the marking phase | |
| 4497 // doesn't observe any more heap expansions. | |
| 4498 _cm->clear_concurrent_marking_in_progress(); | |
| 4499 } | |
| 4500 } | |
| 4501 | |
| 4502 // We can now guarantee that the global stack is empty, since | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4503 // all other tasks have finished. We separated the guarantees so |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4504 // that, if a condition is false, we can immediately find out |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4505 // which one. |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4506 guarantee(_cm->out_of_regions(), "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4507 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4508 guarantee(_task_queue->size() == 0, "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4509 guarantee(!_cm->has_overflown(), "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4510 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
| 342 | 4511 |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
changeset
|
4512 if (_cm->verbose_low()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4513 gclog_or_tty->print_cr("[%u] all tasks terminated", _worker_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
4514 } |
| 342 | 4515 } else { |
| 4516 // Apparently there's more work to do. Let's abort this task. It | |
| 4517 // will restart it and we can hopefully find more things to do. | |
| 4518 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4519 if (_cm->verbose_low()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4520 gclog_or_tty->print_cr("[%u] apparently there is more work to do", |
|
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4521 _worker_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
4522 } |
| 342 | 4523 |
| 4524 set_has_aborted(); | |
| 4525 statsOnly( ++_aborted_termination ); | |
| 4526 } | |
| 4527 } | |
| 4528 | |
| 4529 // Mainly for debugging purposes to make sure that a pointer to the | |
| 4530 // closure which was statically allocated in this frame doesn't | |
| 4531 // escape it by accident. | |
| 3771 | 4532 set_cm_oop_closure(NULL); |
| 342 | 4533 double end_time_ms = os::elapsedVTime() * 1000.0; |
| 4534 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
| 4535 // Update the step history. | |
| 4536 _step_times_ms.add(elapsed_time_ms); | |
| 4537 | |
| 4538 if (has_aborted()) { | |
| 4539 // The task was aborted for some reason. | |
| 4540 | |
| 4541 statsOnly( ++_aborted ); | |
| 4542 | |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
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|
4543 if (_has_timed_out) { |
| 342 | 4544 double diff_ms = elapsed_time_ms - _time_target_ms; |
| 4545 // Keep statistics of how well we did with respect to hitting | |
| 4546 // our target only if we actually timed out (if we aborted for | |
| 4547 // other reasons, then the results might get skewed). | |
| 4548 _marking_step_diffs_ms.add(diff_ms); | |
| 4549 } | |
| 4550 | |
| 4551 if (_cm->has_overflown()) { | |
| 4552 // This is the interesting one. We aborted because a global | |
| 4553 // overflow was raised. This means we have to restart the | |
| 4554 // marking phase and start iterating over regions. However, in | |
| 4555 // order to do this we have to make sure that all tasks stop | |
| 4556 // what they are doing and re-initialise in a safe manner. We | |
| 4557 // will achieve this with the use of two barrier sync points. | |
| 4558 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
changeset
|
4559 if (_cm->verbose_low()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4560 gclog_or_tty->print_cr("[%u] detected overflow", _worker_id); |
|
3776
23d434c6290d
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diff
changeset
|
4561 } |
| 342 | 4562 |
|
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4563 if (!is_serial) { |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4564 // 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
|
4565 // from a parallel context |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4566 _cm->enter_first_sync_barrier(_worker_id); |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4567 |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4568 // When we exit this sync barrier we know that all tasks have |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4569 // stopped doing marking work. So, it's now safe to |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
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parents:
8744
diff
changeset
|
4570 // re-initialise our data structures. At the end of this method, |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4571 // task 0 will clear the global data structures. |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4572 } |
| 342 | 4573 |
| 4574 statsOnly( ++_aborted_overflow ); | |
| 4575 | |
| 4576 // We clear the local state of this task... | |
| 4577 clear_region_fields(); | |
| 4578 | |
|
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4579 if (!is_serial) { |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4580 // ...and enter the second barrier. |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4581 _cm->enter_second_sync_barrier(_worker_id); |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4582 } |
|
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
4583 // 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
|
4584 // marking, everything has been re-initialized and we're |
| 342 | 4585 // ready to restart. |
| 4586 } | |
| 4587 | |
| 4588 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:
6812
diff
changeset
|
4589 gclog_or_tty->print_cr("[%u] <<<<<<<<<< ABORTING, target = %1.2lfms, " |
| 342 | 4590 "elapsed = %1.2lfms <<<<<<<<<<", |
|
6862
8a5ea0a9ccc4
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johnc
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6812
diff
changeset
|
4591 _worker_id, _time_target_ms, elapsed_time_ms); |
|
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
changeset
|
4592 if (_cm->has_aborted()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4593 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
|
4594 _worker_id); |
|
3776
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diff
changeset
|
4595 } |
| 342 | 4596 } |
| 4597 } else { | |
|
3776
23d434c6290d
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3772
diff
changeset
|
4598 if (_cm->verbose_low()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4599 gclog_or_tty->print_cr("[%u] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
| 342 | 4600 "elapsed = %1.2lfms <<<<<<<<<<", |
|
6862
8a5ea0a9ccc4
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johnc
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6812
diff
changeset
|
4601 _worker_id, _time_target_ms, elapsed_time_ms); |
|
3776
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7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
4602 } |
| 342 | 4603 } |
| 4604 | |
| 4605 _claimed = false; | |
| 4606 } | |
| 4607 | |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
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6812
diff
changeset
|
4608 CMTask::CMTask(uint worker_id, |
| 342 | 4609 ConcurrentMark* cm, |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4610 size_t* marked_bytes, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4611 BitMap* card_bm, |
| 342 | 4612 CMTaskQueue* task_queue, |
| 4613 CMTaskQueueSet* task_queues) | |
| 4614 : _g1h(G1CollectedHeap::heap()), | |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4615 _worker_id(worker_id), _cm(cm), |
| 342 | 4616 _claimed(false), |
| 4617 _nextMarkBitMap(NULL), _hash_seed(17), | |
| 4618 _task_queue(task_queue), | |
| 4619 _task_queues(task_queues), | |
| 3771 | 4620 _cm_oop_closure(NULL), |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4621 _marked_bytes_array(marked_bytes), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4622 _card_bm(card_bm) { |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4623 guarantee(task_queue != NULL, "invariant"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4624 guarantee(task_queues != NULL, "invariant"); |
| 342 | 4625 |
| 4626 statsOnly( _clock_due_to_scanning = 0; | |
| 4627 _clock_due_to_marking = 0 ); | |
| 4628 | |
| 4629 _marking_step_diffs_ms.add(0.5); | |
| 4630 } | |
|
2435
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
|
4631 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4632 // These are formatting macros that are used below to ensure |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4633 // 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
|
4634 // header for a particular value and they should be kept consistent |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4635 // with the corresponding macro. Also note that most of the macros add |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4636 // the necessary white space (as a prefix) which makes them a bit |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4637 // easier to compose. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4638 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4639 // 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
|
4640 // 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
|
4641 #define G1PPRL_LINE_PREFIX "###" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4642 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4643 #define G1PPRL_ADDR_BASE_FORMAT " "PTR_FORMAT"-"PTR_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4644 #ifdef _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4645 #define G1PPRL_ADDR_BASE_H_FORMAT " %37s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4646 #else // _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4647 #define G1PPRL_ADDR_BASE_H_FORMAT " %21s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4648 #endif // _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4649 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4650 // For per-region info |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4651 #define G1PPRL_TYPE_FORMAT " %-4s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4652 #define G1PPRL_TYPE_H_FORMAT " %4s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4653 #define G1PPRL_BYTE_FORMAT " "SIZE_FORMAT_W(9) |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4654 #define G1PPRL_BYTE_H_FORMAT " %9s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4655 #define G1PPRL_DOUBLE_FORMAT " %14.1f" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4656 #define G1PPRL_DOUBLE_H_FORMAT " %14s" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4657 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4658 // For summary info |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4659 #define G1PPRL_SUM_ADDR_FORMAT(tag) " "tag":"G1PPRL_ADDR_BASE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4660 #define G1PPRL_SUM_BYTE_FORMAT(tag) " "tag": "SIZE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4661 #define G1PPRL_SUM_MB_FORMAT(tag) " "tag": %1.2f MB" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4662 #define G1PPRL_SUM_MB_PERC_FORMAT(tag) G1PPRL_SUM_MB_FORMAT(tag)" / %1.2f %%" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4663 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4664 G1PrintRegionLivenessInfoClosure:: |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4665 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name) |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4666 : _out(out), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4667 _total_used_bytes(0), _total_capacity_bytes(0), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4668 _total_prev_live_bytes(0), _total_next_live_bytes(0), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4669 _hum_used_bytes(0), _hum_capacity_bytes(0), |
|
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4670 _hum_prev_live_bytes(0), _hum_next_live_bytes(0), |
| 12080 | 4671 _total_remset_bytes(0), _total_strong_code_roots_bytes(0) { |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4672 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4673 MemRegion g1_reserved = g1h->g1_reserved(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4674 double now = os::elapsedTime(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4675 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4676 // Print the header of the output. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4677 _out->cr(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4678 _out->print_cr(G1PPRL_LINE_PREFIX" PHASE %s @ %1.3f", phase_name, now); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4679 _out->print_cr(G1PPRL_LINE_PREFIX" HEAP" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4680 G1PPRL_SUM_ADDR_FORMAT("reserved") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4681 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
4682 p2i(g1_reserved.start()), p2i(g1_reserved.end()), |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4683 HeapRegion::GrainBytes); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4684 _out->print_cr(G1PPRL_LINE_PREFIX); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4685 _out->print_cr(G1PPRL_LINE_PREFIX |
|
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4686 G1PPRL_TYPE_H_FORMAT |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4687 G1PPRL_ADDR_BASE_H_FORMAT |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4688 G1PPRL_BYTE_H_FORMAT |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4689 G1PPRL_BYTE_H_FORMAT |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4690 G1PPRL_BYTE_H_FORMAT |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4691 G1PPRL_DOUBLE_H_FORMAT |
| 12080 | 4692 G1PPRL_BYTE_H_FORMAT |
|
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4693 G1PPRL_BYTE_H_FORMAT, |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4694 "type", "address-range", |
| 12080 | 4695 "used", "prev-live", "next-live", "gc-eff", |
| 4696 "remset", "code-roots"); | |
|
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4697 _out->print_cr(G1PPRL_LINE_PREFIX |
|
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4698 G1PPRL_TYPE_H_FORMAT |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4699 G1PPRL_ADDR_BASE_H_FORMAT |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4700 G1PPRL_BYTE_H_FORMAT |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4701 G1PPRL_BYTE_H_FORMAT |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4702 G1PPRL_BYTE_H_FORMAT |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4703 G1PPRL_DOUBLE_H_FORMAT |
| 12080 | 4704 G1PPRL_BYTE_H_FORMAT |
|
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4705 G1PPRL_BYTE_H_FORMAT, |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4706 "", "", |
| 12080 | 4707 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)", |
| 4708 "(bytes)", "(bytes)"); | |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4709 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4710 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4711 // It takes as a parameter a reference to one of the _hum_* fields, it |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4712 // deduces the corresponding value for a region in a humongous region |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4713 // series (either the region size, or what's left if the _hum_* field |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
4714 // is < the region size), and updates the _hum_* field accordingly. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4715 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4716 size_t bytes = 0; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4717 // The > 0 check is to deal with the prev and next live bytes which |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4718 // could be 0. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4719 if (*hum_bytes > 0) { |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4720 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
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diff
changeset
|
4721 *hum_bytes -= bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4722 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4723 return bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4724 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4725 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4726 // It deduces the values for a region in a humongous region series |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4727 // from the _hum_* fields and updates those accordingly. It assumes |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4728 // that that _hum_* fields have already been set up from the "starts |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4729 // humongous" region and we visit the regions in address order. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4730 void G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* used_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4731 size_t* capacity_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4732 size_t* prev_live_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4733 size_t* next_live_bytes) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4734 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
changeset
|
4735 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4736 *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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diff
changeset
|
4737 *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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diff
changeset
|
4738 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4739 } |
|
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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
|
4740 |
|
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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
|
4741 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
|
20481
c02ec279b062
8057768: Make heap region region type in G1 HeapRegion explicit
brutisso
parents:
20445
diff
changeset
|
4742 const char* type = r->get_type_str(); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4743 HeapWord* bottom = r->bottom(); |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4744 HeapWord* end = r->end(); |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4745 size_t capacity_bytes = r->capacity(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4746 size_t used_bytes = r->used(); |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4747 size_t prev_live_bytes = r->live_bytes(); |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4748 size_t next_live_bytes = r->next_live_bytes(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4749 double gc_eff = r->gc_efficiency(); |
|
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4750 size_t remset_bytes = r->rem_set()->mem_size(); |
| 12080 | 4751 size_t strong_code_roots_bytes = r->rem_set()->strong_code_roots_mem_size(); |
| 4752 | |
|
20481
c02ec279b062
8057768: Make heap region region type in G1 HeapRegion explicit
brutisso
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20445
diff
changeset
|
4753 if (r->startsHumongous()) { |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4754 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
|
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changeset
|
4755 _hum_prev_live_bytes == 0 && _hum_next_live_bytes == 0, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4756 "they should have been zeroed after the last time we used them"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4757 // Set up the _hum_* fields. |
|
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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
|
4758 _hum_capacity_bytes = capacity_bytes; |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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changeset
|
4759 _hum_used_bytes = used_bytes; |
|
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changeset
|
4760 _hum_prev_live_bytes = prev_live_bytes; |
|
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changeset
|
4761 _hum_next_live_bytes = next_live_bytes; |
|
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changeset
|
4762 get_hum_bytes(&used_bytes, &capacity_bytes, |
|
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changeset
|
4763 &prev_live_bytes, &next_live_bytes); |
|
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changeset
|
4764 end = bottom + HeapRegion::GrainWords; |
|
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|
4765 } else if (r->continuesHumongous()) { |
|
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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
|
4766 get_hum_bytes(&used_bytes, &capacity_bytes, |
|
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4767 &prev_live_bytes, &next_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4768 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
|
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diff
changeset
|
4769 } |
|
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diff
changeset
|
4770 |
|
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diff
changeset
|
4771 _total_used_bytes += used_bytes; |
|
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diff
changeset
|
4772 _total_capacity_bytes += capacity_bytes; |
|
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diff
changeset
|
4773 _total_prev_live_bytes += prev_live_bytes; |
|
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diff
changeset
|
4774 _total_next_live_bytes += next_live_bytes; |
|
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
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10186
diff
changeset
|
4775 _total_remset_bytes += remset_bytes; |
| 12080 | 4776 _total_strong_code_roots_bytes += strong_code_roots_bytes; |
|
2435
371bbc844bf1
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diff
changeset
|
4777 |
|
371bbc844bf1
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diff
changeset
|
4778 // Print a line for this particular region. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4779 _out->print_cr(G1PPRL_LINE_PREFIX |
|
371bbc844bf1
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diff
changeset
|
4780 G1PPRL_TYPE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4781 G1PPRL_ADDR_BASE_FORMAT |
|
371bbc844bf1
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diff
changeset
|
4782 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
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diff
changeset
|
4783 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4784 G1PPRL_BYTE_FORMAT |
|
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
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10186
diff
changeset
|
4785 G1PPRL_DOUBLE_FORMAT |
| 12080 | 4786 G1PPRL_BYTE_FORMAT |
|
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4787 G1PPRL_BYTE_FORMAT, |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
4788 type, p2i(bottom), p2i(end), |
| 12080 | 4789 used_bytes, prev_live_bytes, next_live_bytes, gc_eff, |
| 4790 remset_bytes, strong_code_roots_bytes); | |
|
2435
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diff
changeset
|
4791 |
|
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
|
4792 return false; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4793 } |
|
371bbc844bf1
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parents:
2369
diff
changeset
|
4794 |
|
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
|
4795 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
|
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4796 // add static memory usages to remembered set sizes |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4797 _total_remset_bytes += HeapRegionRemSet::fl_mem_size() + HeapRegionRemSet::static_mem_size(); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4798 // Print the footer of the output. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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2369
diff
changeset
|
4799 _out->print_cr(G1PPRL_LINE_PREFIX); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4800 _out->print_cr(G1PPRL_LINE_PREFIX |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4801 " SUMMARY" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4802 G1PPRL_SUM_MB_FORMAT("capacity") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
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diff
changeset
|
4803 G1PPRL_SUM_MB_PERC_FORMAT("used") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4804 G1PPRL_SUM_MB_PERC_FORMAT("prev-live") |
|
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4805 G1PPRL_SUM_MB_PERC_FORMAT("next-live") |
| 12080 | 4806 G1PPRL_SUM_MB_FORMAT("remset") |
| 4807 G1PPRL_SUM_MB_FORMAT("code-roots"), | |
|
2435
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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diff
changeset
|
4808 bytes_to_mb(_total_capacity_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4809 bytes_to_mb(_total_used_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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2369
diff
changeset
|
4810 perc(_total_used_bytes, _total_capacity_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4811 bytes_to_mb(_total_prev_live_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4812 perc(_total_prev_live_bytes, _total_capacity_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4813 bytes_to_mb(_total_next_live_bytes), |
|
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4814 perc(_total_next_live_bytes, _total_capacity_bytes), |
| 12080 | 4815 bytes_to_mb(_total_remset_bytes), |
| 4816 bytes_to_mb(_total_strong_code_roots_bytes)); | |
|
2435
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7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4817 _out->cr(); |
|
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
|
4818 } |