Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.cpp @ 20378:39189caa2894
Merge
| author | tschatzl |
|---|---|
| date | Fri, 29 Aug 2014 13:12:03 +0200 |
| parents | a8ea2f110d87 |
| children | 9337d0e7ea4f |
| 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 | |
| 133 void CMBitMapMappingChangedListener::on_commit(uint start_region, size_t num_regions) { | |
| 134 // We need to clear the bitmap on commit, removing any existing information. | |
| 135 MemRegion mr(G1CollectedHeap::heap()->bottom_addr_for_region(start_region), num_regions * HeapRegion::GrainWords); | |
| 136 _bm->clearRange(mr); | |
| 137 } | |
| 138 | |
| 139 // Closure used for clearing the given mark bitmap. | |
| 140 class ClearBitmapHRClosure : public HeapRegionClosure { | |
| 141 private: | |
| 142 ConcurrentMark* _cm; | |
| 143 CMBitMap* _bitmap; | |
| 144 bool _may_yield; // The closure may yield during iteration. If yielded, abort the iteration. | |
| 145 public: | |
| 146 ClearBitmapHRClosure(ConcurrentMark* cm, CMBitMap* bitmap, bool may_yield) : HeapRegionClosure(), _cm(cm), _bitmap(bitmap), _may_yield(may_yield) { | |
| 147 assert(!may_yield || cm != NULL, "CM must be non-NULL if this closure is expected to yield."); | |
| 148 } | |
| 149 | |
| 150 virtual bool doHeapRegion(HeapRegion* r) { | |
| 151 size_t const chunk_size_in_words = M / HeapWordSize; | |
| 152 | |
| 153 HeapWord* cur = r->bottom(); | |
| 154 HeapWord* const end = r->end(); | |
| 155 | |
| 156 while (cur < end) { | |
| 157 MemRegion mr(cur, MIN2(cur + chunk_size_in_words, end)); | |
| 158 _bitmap->clearRange(mr); | |
| 159 | |
| 160 cur += chunk_size_in_words; | |
| 161 | |
| 162 // Abort iteration if after yielding the marking has been aborted. | |
| 163 if (_may_yield && _cm->do_yield_check() && _cm->has_aborted()) { | |
| 164 return true; | |
| 165 } | |
| 166 // Repeat the asserts from before the start of the closure. We will do them | |
| 167 // as asserts here to minimize their overhead on the product. However, we | |
| 168 // will have them as guarantees at the beginning / end of the bitmap | |
| 169 // clearing to get some checking in the product. | |
| 170 assert(!_may_yield || _cm->cmThread()->during_cycle(), "invariant"); | |
| 171 assert(!_may_yield || !G1CollectedHeap::heap()->mark_in_progress(), "invariant"); | |
| 172 } | |
| 173 | |
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174 return false; |
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175 } |
| 20337 | 176 }; |
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177 |
| 342 | 178 void CMBitMap::clearAll() { |
| 20337 | 179 ClearBitmapHRClosure cl(NULL, this, false /* may_yield */); |
| 180 G1CollectedHeap::heap()->heap_region_iterate(&cl); | |
| 181 guarantee(cl.complete(), "Must have completed iteration."); | |
| 342 | 182 return; |
| 183 } | |
| 184 | |
| 185 void CMBitMap::markRange(MemRegion mr) { | |
| 186 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
| 187 assert(!mr.is_empty(), "unexpected empty region"); | |
| 188 assert((offsetToHeapWord(heapWordToOffset(mr.end())) == | |
| 189 ((HeapWord *) mr.end())), | |
| 190 "markRange memory region end is not card aligned"); | |
| 191 // convert address range into offset range | |
| 192 _bm.at_put_range(heapWordToOffset(mr.start()), | |
| 193 heapWordToOffset(mr.end()), true); | |
| 194 } | |
| 195 | |
| 196 void CMBitMap::clearRange(MemRegion mr) { | |
| 197 mr.intersection(MemRegion(_bmStartWord, _bmWordSize)); | |
| 198 assert(!mr.is_empty(), "unexpected empty region"); | |
| 199 // convert address range into offset range | |
| 200 _bm.at_put_range(heapWordToOffset(mr.start()), | |
| 201 heapWordToOffset(mr.end()), false); | |
| 202 } | |
| 203 | |
| 204 MemRegion CMBitMap::getAndClearMarkedRegion(HeapWord* addr, | |
| 205 HeapWord* end_addr) { | |
| 206 HeapWord* start = getNextMarkedWordAddress(addr); | |
| 207 start = MIN2(start, end_addr); | |
| 208 HeapWord* end = getNextUnmarkedWordAddress(start); | |
| 209 end = MIN2(end, end_addr); | |
| 210 assert(start <= end, "Consistency check"); | |
| 211 MemRegion mr(start, end); | |
| 212 if (!mr.is_empty()) { | |
| 213 clearRange(mr); | |
| 214 } | |
| 215 return mr; | |
| 216 } | |
| 217 | |
| 218 CMMarkStack::CMMarkStack(ConcurrentMark* cm) : | |
| 219 _base(NULL), _cm(cm) | |
| 220 #ifdef ASSERT | |
| 221 , _drain_in_progress(false) | |
| 222 , _drain_in_progress_yields(false) | |
| 223 #endif | |
| 224 {} | |
| 225 | |
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226 bool CMMarkStack::allocate(size_t capacity) { |
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227 // allocate a stack of the requisite depth |
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228 ReservedSpace rs(ReservedSpace::allocation_align_size_up(capacity * sizeof(oop))); |
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229 if (!rs.is_reserved()) { |
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230 warning("ConcurrentMark MarkStack allocation failure"); |
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231 return false; |
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232 } |
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233 MemTracker::record_virtual_memory_type((address)rs.base(), mtGC); |
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234 if (!_virtual_space.initialize(rs, rs.size())) { |
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235 warning("ConcurrentMark MarkStack backing store failure"); |
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236 // Release the virtual memory reserved for the marking stack |
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237 rs.release(); |
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238 return false; |
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239 } |
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240 assert(_virtual_space.committed_size() == rs.size(), |
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241 "Didn't reserve backing store for all of ConcurrentMark stack?"); |
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242 _base = (oop*) _virtual_space.low(); |
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243 setEmpty(); |
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244 _capacity = (jint) capacity; |
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245 _saved_index = -1; |
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246 _should_expand = false; |
| 342 | 247 NOT_PRODUCT(_max_depth = 0); |
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248 return true; |
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249 } |
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250 |
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251 void CMMarkStack::expand() { |
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252 // Called, during remark, if we've overflown the marking stack during marking. |
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253 assert(isEmpty(), "stack should been emptied while handling overflow"); |
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254 assert(_capacity <= (jint) MarkStackSizeMax, "stack bigger than permitted"); |
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255 // Clear expansion flag |
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256 _should_expand = false; |
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257 if (_capacity == (jint) MarkStackSizeMax) { |
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258 if (PrintGCDetails && Verbose) { |
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259 gclog_or_tty->print_cr(" (benign) Can't expand marking stack capacity, at max size limit"); |
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260 } |
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261 return; |
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262 } |
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263 // Double capacity if possible |
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264 jint new_capacity = MIN2(_capacity*2, (jint) MarkStackSizeMax); |
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265 // Do not give up existing stack until we have managed to |
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266 // get the double capacity that we desired. |
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267 ReservedSpace rs(ReservedSpace::allocation_align_size_up(new_capacity * |
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268 sizeof(oop))); |
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269 if (rs.is_reserved()) { |
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270 // Release the backing store associated with old stack |
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271 _virtual_space.release(); |
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272 // Reinitialize virtual space for new stack |
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273 if (!_virtual_space.initialize(rs, rs.size())) { |
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274 fatal("Not enough swap for expanded marking stack capacity"); |
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275 } |
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276 _base = (oop*)(_virtual_space.low()); |
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277 _index = 0; |
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278 _capacity = new_capacity; |
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279 } else { |
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280 if (PrintGCDetails && Verbose) { |
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281 // Failed to double capacity, continue; |
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282 gclog_or_tty->print(" (benign) Failed to expand marking stack capacity from " |
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283 SIZE_FORMAT"K to " SIZE_FORMAT"K", |
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284 _capacity / K, new_capacity / K); |
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285 } |
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286 } |
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287 } |
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288 |
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289 void CMMarkStack::set_should_expand() { |
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290 // If we're resetting the marking state because of an |
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291 // marking stack overflow, record that we should, if |
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292 // possible, expand the stack. |
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293 _should_expand = _cm->has_overflown(); |
| 342 | 294 } |
| 295 | |
| 296 CMMarkStack::~CMMarkStack() { | |
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297 if (_base != NULL) { |
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298 _base = NULL; |
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299 _virtual_space.release(); |
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300 } |
| 342 | 301 } |
| 302 | |
| 303 void CMMarkStack::par_push(oop ptr) { | |
| 304 while (true) { | |
| 305 if (isFull()) { | |
| 306 _overflow = true; | |
| 307 return; | |
| 308 } | |
| 309 // Otherwise... | |
| 310 jint index = _index; | |
| 311 jint next_index = index+1; | |
| 312 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 313 if (res == index) { | |
| 314 _base[index] = ptr; | |
| 315 // Note that we don't maintain this atomically. We could, but it | |
| 316 // doesn't seem necessary. | |
| 317 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
| 318 return; | |
| 319 } | |
| 320 // Otherwise, we need to try again. | |
| 321 } | |
| 322 } | |
| 323 | |
| 324 void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) { | |
| 325 while (true) { | |
| 326 if (isFull()) { | |
| 327 _overflow = true; | |
| 328 return; | |
| 329 } | |
| 330 // Otherwise... | |
| 331 jint index = _index; | |
| 332 jint next_index = index + n; | |
| 333 if (next_index > _capacity) { | |
| 334 _overflow = true; | |
| 335 return; | |
| 336 } | |
| 337 jint res = Atomic::cmpxchg(next_index, &_index, index); | |
| 338 if (res == index) { | |
| 339 for (int i = 0; i < n; i++) { | |
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340 int ind = index + i; |
| 342 | 341 assert(ind < _capacity, "By overflow test above."); |
| 342 _base[ind] = ptr_arr[i]; | |
| 343 } | |
| 344 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); | |
| 345 return; | |
| 346 } | |
| 347 // Otherwise, we need to try again. | |
| 348 } | |
| 349 } | |
| 350 | |
| 351 void CMMarkStack::par_push_arr(oop* ptr_arr, int n) { | |
| 352 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 353 jint start = _index; | |
| 354 jint next_index = start + n; | |
| 355 if (next_index > _capacity) { | |
| 356 _overflow = true; | |
| 357 return; | |
| 358 } | |
| 359 // Otherwise. | |
| 360 _index = next_index; | |
| 361 for (int i = 0; i < n; i++) { | |
| 362 int ind = start + i; | |
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363 assert(ind < _capacity, "By overflow test above."); |
| 342 | 364 _base[ind] = ptr_arr[i]; |
| 365 } | |
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366 NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index)); |
| 342 | 367 } |
| 368 | |
| 369 bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) { | |
| 370 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
| 371 jint index = _index; | |
| 372 if (index == 0) { | |
| 373 *n = 0; | |
| 374 return false; | |
| 375 } else { | |
| 376 int k = MIN2(max, index); | |
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377 jint new_ind = index - k; |
| 342 | 378 for (int j = 0; j < k; j++) { |
| 379 ptr_arr[j] = _base[new_ind + j]; | |
| 380 } | |
| 381 _index = new_ind; | |
| 382 *n = k; | |
| 383 return true; | |
| 384 } | |
| 385 } | |
| 386 | |
| 387 template<class OopClosureClass> | |
| 388 bool CMMarkStack::drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after) { | |
| 389 assert(!_drain_in_progress || !_drain_in_progress_yields || yield_after | |
| 390 || SafepointSynchronize::is_at_safepoint(), | |
| 391 "Drain recursion must be yield-safe."); | |
| 392 bool res = true; | |
| 393 debug_only(_drain_in_progress = true); | |
| 394 debug_only(_drain_in_progress_yields = yield_after); | |
| 395 while (!isEmpty()) { | |
| 396 oop newOop = pop(); | |
| 397 assert(G1CollectedHeap::heap()->is_in_reserved(newOop), "Bad pop"); | |
| 398 assert(newOop->is_oop(), "Expected an oop"); | |
| 399 assert(bm == NULL || bm->isMarked((HeapWord*)newOop), | |
| 400 "only grey objects on this stack"); | |
| 401 newOop->oop_iterate(cl); | |
| 402 if (yield_after && _cm->do_yield_check()) { | |
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403 res = false; |
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404 break; |
| 342 | 405 } |
| 406 } | |
| 407 debug_only(_drain_in_progress = false); | |
| 408 return res; | |
| 409 } | |
| 410 | |
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411 void CMMarkStack::note_start_of_gc() { |
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412 assert(_saved_index == -1, |
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413 "note_start_of_gc()/end_of_gc() bracketed incorrectly"); |
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414 _saved_index = _index; |
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415 } |
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416 |
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417 void CMMarkStack::note_end_of_gc() { |
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418 // This is intentionally a guarantee, instead of an assert. If we |
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419 // accidentally add something to the mark stack during GC, it |
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420 // will be a correctness issue so it's better if we crash. we'll |
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421 // only check this once per GC anyway, so it won't be a performance |
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422 // issue in any way. |
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423 guarantee(_saved_index == _index, |
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424 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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425 _saved_index = -1; |
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426 } |
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427 |
| 342 | 428 void CMMarkStack::oops_do(OopClosure* f) { |
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429 assert(_saved_index == _index, |
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430 err_msg("saved index: %d index: %d", _saved_index, _index)); |
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431 for (int i = 0; i < _index; i += 1) { |
| 342 | 432 f->do_oop(&_base[i]); |
| 433 } | |
| 434 } | |
| 435 | |
| 436 bool ConcurrentMark::not_yet_marked(oop obj) const { | |
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437 return _g1h->is_obj_ill(obj); |
| 342 | 438 } |
| 439 | |
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440 CMRootRegions::CMRootRegions() : |
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441 _young_list(NULL), _cm(NULL), _scan_in_progress(false), |
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442 _should_abort(false), _next_survivor(NULL) { } |
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443 |
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444 void CMRootRegions::init(G1CollectedHeap* g1h, ConcurrentMark* cm) { |
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445 _young_list = g1h->young_list(); |
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446 _cm = cm; |
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447 } |
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448 |
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449 void CMRootRegions::prepare_for_scan() { |
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450 assert(!scan_in_progress(), "pre-condition"); |
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451 |
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452 // Currently, only survivors can be root regions. |
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453 assert(_next_survivor == NULL, "pre-condition"); |
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454 _next_survivor = _young_list->first_survivor_region(); |
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455 _scan_in_progress = (_next_survivor != NULL); |
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456 _should_abort = false; |
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457 } |
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458 |
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459 HeapRegion* CMRootRegions::claim_next() { |
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460 if (_should_abort) { |
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461 // If someone has set the should_abort flag, we return NULL to |
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462 // force the caller to bail out of their loop. |
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463 return NULL; |
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464 } |
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465 |
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466 // Currently, only survivors can be root regions. |
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467 HeapRegion* res = _next_survivor; |
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468 if (res != NULL) { |
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469 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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470 // Read it again in case it changed while we were waiting for the lock. |
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471 res = _next_survivor; |
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472 if (res != NULL) { |
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473 if (res == _young_list->last_survivor_region()) { |
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474 // We just claimed the last survivor so store NULL to indicate |
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475 // that we're done. |
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476 _next_survivor = NULL; |
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477 } else { |
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478 _next_survivor = res->get_next_young_region(); |
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479 } |
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480 } else { |
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481 // Someone else claimed the last survivor while we were trying |
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482 // to take the lock so nothing else to do. |
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483 } |
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484 } |
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485 assert(res == NULL || res->is_survivor(), "post-condition"); |
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486 |
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487 return res; |
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488 } |
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489 |
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490 void CMRootRegions::scan_finished() { |
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491 assert(scan_in_progress(), "pre-condition"); |
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492 |
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493 // Currently, only survivors can be root regions. |
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494 if (!_should_abort) { |
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495 assert(_next_survivor == NULL, "we should have claimed all survivors"); |
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496 } |
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497 _next_survivor = NULL; |
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498 |
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499 { |
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500 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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501 _scan_in_progress = false; |
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502 RootRegionScan_lock->notify_all(); |
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503 } |
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504 } |
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505 |
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506 bool CMRootRegions::wait_until_scan_finished() { |
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507 if (!scan_in_progress()) return false; |
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508 |
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509 { |
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510 MutexLockerEx x(RootRegionScan_lock, Mutex::_no_safepoint_check_flag); |
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511 while (scan_in_progress()) { |
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512 RootRegionScan_lock->wait(Mutex::_no_safepoint_check_flag); |
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513 } |
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514 } |
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515 return true; |
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516 } |
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517 |
| 342 | 518 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
| 519 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 520 #endif // _MSC_VER | |
| 521 | |
|
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522 uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) { |
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523 return MAX2((n_par_threads + 2) / 4, 1U); |
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524 } |
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525 |
| 20337 | 526 ConcurrentMark::ConcurrentMark(G1CollectedHeap* g1h, G1RegionToSpaceMapper* prev_bitmap_storage, G1RegionToSpaceMapper* next_bitmap_storage) : |
|
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527 _g1h(g1h), |
| 20337 | 528 _markBitMap1(), |
| 529 _markBitMap2(), | |
| 342 | 530 _parallel_marking_threads(0), |
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531 _max_parallel_marking_threads(0), |
| 342 | 532 _sleep_factor(0.0), |
| 533 _marking_task_overhead(1.0), | |
| 534 _cleanup_sleep_factor(0.0), | |
| 535 _cleanup_task_overhead(1.0), | |
| 2152 | 536 _cleanup_list("Cleanup List"), |
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537 _region_bm((BitMap::idx_t)(g1h->max_regions()), false /* in_resource_area*/), |
| 20337 | 538 _card_bm((g1h->reserved_region().byte_size() + CardTableModRefBS::card_size - 1) >> |
|
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539 CardTableModRefBS::card_shift, |
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540 false /* in_resource_area*/), |
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541 |
| 342 | 542 _prevMarkBitMap(&_markBitMap1), |
| 543 _nextMarkBitMap(&_markBitMap2), | |
| 544 | |
| 545 _markStack(this), | |
| 546 // _finger set in set_non_marking_state | |
| 547 | |
|
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548 _max_worker_id(MAX2((uint)ParallelGCThreads, 1U)), |
| 342 | 549 // _active_tasks set in set_non_marking_state |
| 550 // _tasks set inside the constructor | |
|
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551 _task_queues(new CMTaskQueueSet((int) _max_worker_id)), |
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552 _terminator(ParallelTaskTerminator((int) _max_worker_id, _task_queues)), |
| 342 | 553 |
| 554 _has_overflown(false), | |
| 555 _concurrent(false), | |
|
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556 _has_aborted(false), |
|
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557 _aborted_gc_id(GCId::undefined()), |
|
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558 _restart_for_overflow(false), |
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559 _concurrent_marking_in_progress(false), |
| 342 | 560 |
| 561 // _verbose_level set below | |
| 562 | |
| 563 _init_times(), | |
| 564 _remark_times(), _remark_mark_times(), _remark_weak_ref_times(), | |
| 565 _cleanup_times(), | |
| 566 _total_counting_time(0.0), | |
| 567 _total_rs_scrub_time(0.0), | |
|
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568 |
|
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569 _parallel_workers(NULL), |
|
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570 |
|
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571 _count_card_bitmaps(NULL), |
|
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572 _count_marked_bytes(NULL), |
|
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573 _completed_initialization(false) { |
|
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574 CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel; |
|
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575 if (verbose_level < no_verbose) { |
| 342 | 576 verbose_level = no_verbose; |
|
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577 } |
|
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578 if (verbose_level > high_verbose) { |
| 342 | 579 verbose_level = high_verbose; |
|
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580 } |
| 342 | 581 _verbose_level = verbose_level; |
| 582 | |
|
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583 if (verbose_low()) { |
| 342 | 584 gclog_or_tty->print_cr("[global] init, heap start = "PTR_FORMAT", " |
|
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585 "heap end = " INTPTR_FORMAT, p2i(_heap_start), p2i(_heap_end)); |
|
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586 } |
| 342 | 587 |
| 20337 | 588 _markBitMap1.initialize(g1h->reserved_region(), prev_bitmap_storage); |
| 589 _markBitMap2.initialize(g1h->reserved_region(), next_bitmap_storage); | |
| 342 | 590 |
| 591 // Create & start a ConcurrentMark thread. | |
|
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592 _cmThread = new ConcurrentMarkThread(this); |
|
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593 assert(cmThread() != NULL, "CM Thread should have been created"); |
|
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594 assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm"); |
|
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595 if (_cmThread->osthread() == NULL) { |
|
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596 vm_shutdown_during_initialization("Could not create ConcurrentMarkThread"); |
|
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597 } |
|
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598 |
| 342 | 599 assert(CGC_lock != NULL, "Where's the CGC_lock?"); |
| 20337 | 600 assert(_markBitMap1.covers(g1h->reserved_region()), "_markBitMap1 inconsistency"); |
| 601 assert(_markBitMap2.covers(g1h->reserved_region()), "_markBitMap2 inconsistency"); | |
| 342 | 602 |
| 603 SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set(); | |
| 1282 | 604 satb_qs.set_buffer_size(G1SATBBufferSize); |
| 342 | 605 |
|
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606 _root_regions.init(_g1h, this); |
|
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607 |
| 1284 | 608 if (ConcGCThreads > ParallelGCThreads) { |
|
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609 warning("Can't have more ConcGCThreads (" UINTX_FORMAT ") " |
|
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610 "than ParallelGCThreads (" UINTX_FORMAT ").", |
|
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611 ConcGCThreads, ParallelGCThreads); |
|
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612 return; |
| 342 | 613 } |
| 614 if (ParallelGCThreads == 0) { | |
| 615 // if we are not running with any parallel GC threads we will not | |
| 616 // spawn any marking threads either | |
|
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617 _parallel_marking_threads = 0; |
|
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618 _max_parallel_marking_threads = 0; |
|
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619 _sleep_factor = 0.0; |
|
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620 _marking_task_overhead = 1.0; |
| 342 | 621 } else { |
|
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622 if (!FLAG_IS_DEFAULT(ConcGCThreads) && ConcGCThreads > 0) { |
|
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|
623 // Note: ConcGCThreads has precedence over G1MarkingOverheadPercent |
| 342 | 624 // if both are set |
| 625 _sleep_factor = 0.0; | |
| 626 _marking_task_overhead = 1.0; | |
| 751 | 627 } else if (G1MarkingOverheadPercent > 0) { |
|
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|
628 // We will calculate the number of parallel marking threads based |
|
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|
629 // on a target overhead with respect to the soft real-time goal |
| 751 | 630 double marking_overhead = (double) G1MarkingOverheadPercent / 100.0; |
| 342 | 631 double overall_cm_overhead = |
| 751 | 632 (double) MaxGCPauseMillis * marking_overhead / |
| 633 (double) GCPauseIntervalMillis; | |
| 342 | 634 double cpu_ratio = 1.0 / (double) os::processor_count(); |
| 635 double marking_thread_num = ceil(overall_cm_overhead / cpu_ratio); | |
| 636 double marking_task_overhead = | |
| 637 overall_cm_overhead / marking_thread_num * | |
| 638 (double) os::processor_count(); | |
| 639 double sleep_factor = | |
| 640 (1.0 - marking_task_overhead) / marking_task_overhead; | |
| 641 | |
|
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|
642 FLAG_SET_ERGO(uintx, ConcGCThreads, (uint) marking_thread_num); |
| 342 | 643 _sleep_factor = sleep_factor; |
| 644 _marking_task_overhead = marking_task_overhead; | |
| 645 } else { | |
|
8006
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8006894: G1: Number of marking threads missing from PrintFlagsFinal output
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|
646 // Calculate the number of parallel marking threads by scaling |
|
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|
647 // the number of parallel GC threads. |
|
4700e77d44c1
8006894: G1: Number of marking threads missing from PrintFlagsFinal output
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|
648 uint marking_thread_num = scale_parallel_threads((uint) ParallelGCThreads); |
|
4700e77d44c1
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|
649 FLAG_SET_ERGO(uintx, ConcGCThreads, marking_thread_num); |
| 342 | 650 _sleep_factor = 0.0; |
| 651 _marking_task_overhead = 1.0; | |
| 652 } | |
| 653 | |
|
8006
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654 assert(ConcGCThreads > 0, "Should have been set"); |
|
4700e77d44c1
8006894: G1: Number of marking threads missing from PrintFlagsFinal output
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|
655 _parallel_marking_threads = (uint) ConcGCThreads; |
|
4700e77d44c1
8006894: G1: Number of marking threads missing from PrintFlagsFinal output
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|
656 _max_parallel_marking_threads = _parallel_marking_threads; |
|
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|
657 |
|
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7055073: G1: code cleanup in the concurrentMark.* files
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|
658 if (parallel_marking_threads() > 1) { |
| 342 | 659 _cleanup_task_overhead = 1.0; |
|
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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|
660 } else { |
| 342 | 661 _cleanup_task_overhead = marking_task_overhead(); |
|
3776
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|
662 } |
| 342 | 663 _cleanup_sleep_factor = |
| 664 (1.0 - cleanup_task_overhead()) / cleanup_task_overhead(); | |
| 665 | |
| 666 #if 0 | |
| 667 gclog_or_tty->print_cr("Marking Threads %d", parallel_marking_threads()); | |
| 668 gclog_or_tty->print_cr("CM Marking Task Overhead %1.4lf", marking_task_overhead()); | |
| 669 gclog_or_tty->print_cr("CM Sleep Factor %1.4lf", sleep_factor()); | |
| 670 gclog_or_tty->print_cr("CL Marking Task Overhead %1.4lf", cleanup_task_overhead()); | |
| 671 gclog_or_tty->print_cr("CL Sleep Factor %1.4lf", cleanup_sleep_factor()); | |
| 672 #endif | |
| 673 | |
|
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|
674 guarantee(parallel_marking_threads() > 0, "peace of mind"); |
|
1833
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6984287: Regularize how GC parallel workers are specified.
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|
675 _parallel_workers = new FlexibleWorkGang("G1 Parallel Marking Threads", |
|
4728
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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|
676 _max_parallel_marking_threads, false, true); |
|
1833
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|
677 if (_parallel_workers == NULL) { |
| 342 | 678 vm_exit_during_initialization("Failed necessary allocation."); |
|
1833
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6984287: Regularize how GC parallel workers are specified.
jmasa
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|
679 } else { |
|
8b10f48633dc
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jmasa
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|
680 _parallel_workers->initialize_workers(); |
|
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jmasa
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|
681 } |
| 342 | 682 } |
| 683 | |
|
7397
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|
684 if (FLAG_IS_DEFAULT(MarkStackSize)) { |
|
442f942757c0
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|
685 uintx mark_stack_size = |
|
442f942757c0
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|
686 MIN2(MarkStackSizeMax, |
|
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|
687 MAX2(MarkStackSize, (uintx) (parallel_marking_threads() * TASKQUEUE_SIZE))); |
|
442f942757c0
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|
688 // Verify that the calculated value for MarkStackSize is in range. |
|
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|
689 // It would be nice to use the private utility routine from Arguments. |
|
442f942757c0
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|
690 if (!(mark_stack_size >= 1 && mark_stack_size <= MarkStackSizeMax)) { |
|
442f942757c0
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|
691 warning("Invalid value calculated for MarkStackSize (" UINTX_FORMAT "): " |
|
442f942757c0
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changeset
|
692 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
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|
693 mark_stack_size, (uintx) 1, MarkStackSizeMax); |
|
7397
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
694 return; |
|
442f942757c0
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diff
changeset
|
695 } |
|
442f942757c0
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|
696 FLAG_SET_ERGO(uintx, MarkStackSize, mark_stack_size); |
|
442f942757c0
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|
697 } else { |
|
442f942757c0
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|
698 // Verify MarkStackSize is in range. |
|
442f942757c0
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|
699 if (FLAG_IS_CMDLINE(MarkStackSize)) { |
|
442f942757c0
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|
700 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
701 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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changeset
|
702 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT "): " |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
703 "must be between " UINTX_FORMAT " and " UINTX_FORMAT, |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
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diff
changeset
|
704 MarkStackSize, (uintx) 1, MarkStackSizeMax); |
|
7397
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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|
705 return; |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
706 } |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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diff
changeset
|
707 } else if (FLAG_IS_CMDLINE(MarkStackSizeMax)) { |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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diff
changeset
|
708 if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) { |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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parents:
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diff
changeset
|
709 warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT ")" |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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changeset
|
710 " or for MarkStackSizeMax (" UINTX_FORMAT ")", |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
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diff
changeset
|
711 MarkStackSize, MarkStackSizeMax); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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diff
changeset
|
712 return; |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
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parents:
6865
diff
changeset
|
713 } |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
714 } |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
715 } |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
716 } |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
717 |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
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diff
changeset
|
718 if (!_markStack.allocate(MarkStackSize)) { |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
719 warning("Failed to allocate CM marking stack"); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
720 return; |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
721 } |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
722 |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
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diff
changeset
|
723 _tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_worker_id, mtGC); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
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changeset
|
724 _accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_worker_id, mtGC); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
725 |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
726 _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
johnc
parents:
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diff
changeset
|
727 _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
johnc
parents:
6865
diff
changeset
|
728 |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
729 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:
6865
diff
changeset
|
730 |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
731 // 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
parents:
6865
diff
changeset
|
732 _active_tasks = _max_worker_id; |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
733 |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
734 size_t max_regions = (size_t) _g1h->max_regions(); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
735 for (uint i = 0; i < _max_worker_id; ++i) { |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
736 CMTaskQueue* task_queue = new CMTaskQueue(); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
737 task_queue->initialize(); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
738 _task_queues->register_queue(i, task_queue); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
739 |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
740 _count_card_bitmaps[i] = BitMap(card_bm_size, false); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
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diff
changeset
|
741 _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
parents:
6865
diff
changeset
|
742 |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
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diff
changeset
|
743 _tasks[i] = new CMTask(i, this, |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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diff
changeset
|
744 _count_marked_bytes[i], |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
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diff
changeset
|
745 &_count_card_bitmaps[i], |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
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diff
changeset
|
746 task_queue, _task_queues); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
747 |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
748 _accum_task_vtime[i] = 0.0; |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
749 } |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
750 |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
751 // 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
parents:
6865
diff
changeset
|
752 // in biasing indexes into the accounting card bitmaps. |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
753 _heap_bottom_card_num = |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
754 intptr_t(uintptr_t(_g1h->reserved_region().start()) >> |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
755 CardTableModRefBS::card_shift); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
756 |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
6865
diff
changeset
|
757 // 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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diff
changeset
|
758 clear_all_count_data(); |
|
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
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diff
changeset
|
759 |
| 342 | 760 // so that the call below can read a sensible value |
| 20337 | 761 _heap_start = g1h->reserved_region().start(); |
| 342 | 762 set_non_marking_state(); |
|
7397
442f942757c0
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
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diff
changeset
|
763 _completed_initialization = true; |
| 342 | 764 } |
| 765 | |
| 766 void ConcurrentMark::reset() { | |
| 767 // Starting values for these two. This should be called in a STW | |
| 20337 | 768 // phase. |
| 769 MemRegion reserved = _g1h->g1_reserved(); | |
| 770 _heap_start = reserved.start(); | |
| 771 _heap_end = reserved.end(); | |
| 342 | 772 |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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1022
diff
changeset
|
773 // Separated the asserts so that we know which one fires. |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
774 assert(_heap_start != NULL, "heap bounds should look ok"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
775 assert(_heap_end != NULL, "heap bounds should look ok"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
776 assert(_heap_start < _heap_end, "heap bounds should look ok"); |
| 342 | 777 |
|
7450
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
johnc
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7397
diff
changeset
|
778 // Reset all the marking data structures and any necessary flags |
|
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
johnc
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7397
diff
changeset
|
779 reset_marking_state(); |
| 342 | 780 |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
781 if (verbose_low()) { |
| 342 | 782 gclog_or_tty->print_cr("[global] resetting"); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
783 } |
| 342 | 784 |
| 785 // We do reset all of them, since different phases will use | |
| 786 // different number of active threads. So, it's easiest to have all | |
| 787 // of them ready. | |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
788 for (uint i = 0; i < _max_worker_id; ++i) { |
| 342 | 789 _tasks[i]->reset(_nextMarkBitMap); |
|
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790 } |
| 342 | 791 |
| 792 // we need this to make sure that the flag is on during the evac | |
| 793 // pause with initial mark piggy-backed | |
| 794 set_concurrent_marking_in_progress(); | |
| 795 } | |
| 796 | |
|
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797 |
|
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798 void ConcurrentMark::reset_marking_state(bool clear_overflow) { |
|
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799 _markStack.set_should_expand(); |
|
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800 _markStack.setEmpty(); // Also clears the _markStack overflow flag |
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801 if (clear_overflow) { |
|
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802 clear_has_overflown(); |
|
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803 } else { |
|
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804 assert(has_overflown(), "pre-condition"); |
|
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805 } |
|
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806 _finger = _heap_start; |
|
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807 |
|
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808 for (uint i = 0; i < _max_worker_id; ++i) { |
|
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809 CMTaskQueue* queue = _task_queues->queue(i); |
|
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810 queue->set_empty(); |
|
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811 } |
|
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812 } |
|
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813 |
|
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814 void ConcurrentMark::set_concurrency(uint active_tasks) { |
|
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815 assert(active_tasks <= _max_worker_id, "we should not have more"); |
| 342 | 816 |
| 817 _active_tasks = active_tasks; | |
| 818 // Need to update the three data structures below according to the | |
| 819 // number of active threads for this phase. | |
| 820 _terminator = ParallelTaskTerminator((int) active_tasks, _task_queues); | |
| 821 _first_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
| 822 _second_overflow_barrier_sync.set_n_workers((int) active_tasks); | |
|
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823 } |
|
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824 |
|
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825 void ConcurrentMark::set_concurrency_and_phase(uint active_tasks, bool concurrent) { |
|
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826 set_concurrency(active_tasks); |
| 342 | 827 |
| 828 _concurrent = concurrent; | |
| 829 // We propagate this to all tasks, not just the active ones. | |
|
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830 for (uint i = 0; i < _max_worker_id; ++i) |
| 342 | 831 _tasks[i]->set_concurrent(concurrent); |
| 832 | |
| 833 if (concurrent) { | |
| 834 set_concurrent_marking_in_progress(); | |
| 835 } else { | |
| 836 // We currently assume that the concurrent flag has been set to | |
| 837 // false before we start remark. At this point we should also be | |
| 838 // in a STW phase. | |
|
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839 assert(!concurrent_marking_in_progress(), "invariant"); |
|
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|
840 assert(out_of_regions(), |
|
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841 err_msg("only way to get here: _finger: "PTR_FORMAT", _heap_end: "PTR_FORMAT, |
|
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842 p2i(_finger), p2i(_heap_end))); |
| 342 | 843 } |
| 844 } | |
| 845 | |
| 846 void ConcurrentMark::set_non_marking_state() { | |
| 847 // We set the global marking state to some default values when we're | |
| 848 // not doing marking. | |
|
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849 reset_marking_state(); |
| 342 | 850 _active_tasks = 0; |
| 851 clear_concurrent_marking_in_progress(); | |
| 852 } | |
| 853 | |
| 854 ConcurrentMark::~ConcurrentMark() { | |
| 4735 | 855 // The ConcurrentMark instance is never freed. |
| 856 ShouldNotReachHere(); | |
| 342 | 857 } |
| 858 | |
| 859 void ConcurrentMark::clearNextBitmap() { | |
|
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860 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
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861 |
|
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862 // Make sure that the concurrent mark thread looks to still be in |
|
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863 // the current cycle. |
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864 guarantee(cmThread()->during_cycle(), "invariant"); |
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865 |
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866 // We are finishing up the current cycle by clearing the next |
|
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867 // marking bitmap and getting it ready for the next cycle. During |
|
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868 // this time no other cycle can start. So, let's make sure that this |
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869 // is the case. |
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870 guarantee(!g1h->mark_in_progress(), "invariant"); |
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871 |
| 20337 | 872 ClearBitmapHRClosure cl(this, _nextMarkBitMap, true /* may_yield */); |
| 873 g1h->heap_region_iterate(&cl); | |
| 874 | |
| 875 // Clear the liveness counting data. If the marking has been aborted, the abort() | |
| 876 // call already did that. | |
| 877 if (cl.complete()) { | |
| 878 clear_all_count_data(); | |
|
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879 } |
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880 |
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881 // Repeat the asserts from above. |
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882 guarantee(cmThread()->during_cycle(), "invariant"); |
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883 guarantee(!g1h->mark_in_progress(), "invariant"); |
| 342 | 884 } |
| 885 | |
| 20337 | 886 class CheckBitmapClearHRClosure : public HeapRegionClosure { |
| 887 CMBitMap* _bitmap; | |
| 888 bool _error; | |
| 889 public: | |
| 890 CheckBitmapClearHRClosure(CMBitMap* bitmap) : _bitmap(bitmap) { | |
| 891 } | |
| 892 | |
| 893 virtual bool doHeapRegion(HeapRegion* r) { | |
| 894 return _bitmap->getNextMarkedWordAddress(r->bottom(), r->end()) != r->end(); | |
| 895 } | |
| 896 }; | |
| 897 | |
|
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898 bool ConcurrentMark::nextMarkBitmapIsClear() { |
| 20337 | 899 CheckBitmapClearHRClosure cl(_nextMarkBitMap); |
| 900 _g1h->heap_region_iterate(&cl); | |
| 901 return cl.complete(); | |
|
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902 } |
|
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903 |
| 342 | 904 class NoteStartOfMarkHRClosure: public HeapRegionClosure { |
| 905 public: | |
| 906 bool doHeapRegion(HeapRegion* r) { | |
| 907 if (!r->continuesHumongous()) { | |
|
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908 r->note_start_of_marking(); |
| 342 | 909 } |
| 910 return false; | |
| 911 } | |
| 912 }; | |
| 913 | |
| 914 void ConcurrentMark::checkpointRootsInitialPre() { | |
| 915 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 916 G1CollectorPolicy* g1p = g1h->g1_policy(); | |
| 917 | |
| 918 _has_aborted = false; | |
| 919 | |
|
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920 #ifndef PRODUCT |
| 1044 | 921 if (G1PrintReachableAtInitialMark) { |
| 1388 | 922 print_reachable("at-cycle-start", |
|
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923 VerifyOption_G1UsePrevMarking, true /* all */); |
| 1044 | 924 } |
|
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925 #endif |
| 342 | 926 |
| 927 // Initialise marking structures. This has to be done in a STW phase. | |
| 928 reset(); | |
|
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929 |
|
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930 // For each region note start of marking. |
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931 NoteStartOfMarkHRClosure startcl; |
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932 g1h->heap_region_iterate(&startcl); |
| 342 | 933 } |
| 934 | |
| 935 | |
| 936 void ConcurrentMark::checkpointRootsInitialPost() { | |
| 937 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 938 | |
|
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939 // If we force an overflow during remark, the remark operation will |
|
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940 // actually abort and we'll restart concurrent marking. If we always |
|
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941 // force an oveflow during remark we'll never actually complete the |
|
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942 // marking phase. So, we initilize this here, at the start of the |
|
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943 // cycle, so that at the remaining overflow number will decrease at |
|
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944 // every remark and we'll eventually not need to cause one. |
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945 force_overflow_stw()->init(); |
|
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946 |
|
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947 // Start Concurrent Marking weak-reference discovery. |
|
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948 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
|
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949 // enable ("weak") refs discovery |
|
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950 rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
|
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|
951 rp->setup_policy(false); // snapshot the soft ref policy to be used in this cycle |
| 342 | 952 |
| 953 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
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954 // This is the start of the marking cycle, we're expected all |
|
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955 // threads to have SATB queues with active set to false. |
|
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956 satb_mq_set.set_active_all_threads(true, /* new active value */ |
|
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957 false /* expected_active */); |
| 342 | 958 |
|
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959 _root_regions.prepare_for_scan(); |
|
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960 |
| 342 | 961 // update_g1_committed() will be called at the end of an evac pause |
| 962 // when marking is on. So, it's also called at the end of the | |
| 963 // initial-mark pause to update the heap end, if the heap expands | |
| 964 // during it. No need to call it here. | |
| 965 } | |
| 966 | |
| 967 /* | |
|
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968 * Notice that in the next two methods, we actually leave the STS |
|
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969 * during the barrier sync and join it immediately afterwards. If we |
|
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970 * do not do this, the following deadlock can occur: one thread could |
|
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971 * be in the barrier sync code, waiting for the other thread to also |
|
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972 * sync up, whereas another one could be trying to yield, while also |
|
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973 * waiting for the other threads to sync up too. |
|
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974 * |
|
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975 * Note, however, that this code is also used during remark and in |
|
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976 * this case we should not attempt to leave / enter the STS, otherwise |
|
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977 * we'll either hit an asseert (debug / fastdebug) or deadlock |
|
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978 * (product). So we should only leave / enter the STS if we are |
|
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979 * operating concurrently. |
|
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980 * |
|
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981 * Because the thread that does the sync barrier has left the STS, it |
|
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982 * is possible to be suspended for a Full GC or an evacuation pause |
|
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983 * could occur. This is actually safe, since the entering the sync |
|
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984 * barrier is one of the last things do_marking_step() does, and it |
|
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985 * doesn't manipulate any data structures afterwards. |
|
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986 */ |
| 342 | 987 |
|
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988 void ConcurrentMark::enter_first_sync_barrier(uint worker_id) { |
|
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989 if (verbose_low()) { |
|
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990 gclog_or_tty->print_cr("[%u] entering first barrier", worker_id); |
|
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991 } |
| 342 | 992 |
|
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993 if (concurrent()) { |
| 20192 | 994 SuspendibleThreadSet::leave(); |
|
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995 } |
|
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996 |
|
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997 bool barrier_aborted = !_first_overflow_barrier_sync.enter(); |
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998 |
|
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999 if (concurrent()) { |
| 20192 | 1000 SuspendibleThreadSet::join(); |
|
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1001 } |
| 342 | 1002 // at this point everyone should have synced up and not be doing any |
| 1003 // more work | |
| 1004 | |
|
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1005 if (verbose_low()) { |
|
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1006 if (barrier_aborted) { |
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1007 gclog_or_tty->print_cr("[%u] aborted first barrier", worker_id); |
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1008 } else { |
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1009 gclog_or_tty->print_cr("[%u] leaving first barrier", worker_id); |
|
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1010 } |
|
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1011 } |
|
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1012 |
|
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1013 if (barrier_aborted) { |
|
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1014 // If the barrier aborted we ignore the overflow condition and |
|
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1015 // just abort the whole marking phase as quickly as possible. |
|
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1016 return; |
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1017 } |
| 342 | 1018 |
|
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1019 // If we're executing the concurrent phase of marking, reset the marking |
|
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1020 // state; otherwise the marking state is reset after reference processing, |
|
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1021 // during the remark pause. |
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1022 // If we reset here as a result of an overflow during the remark we will |
|
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1023 // see assertion failures from any subsequent set_concurrency_and_phase() |
|
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1024 // calls. |
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1025 if (concurrent()) { |
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1026 // let the task associated with with worker 0 do this |
|
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1027 if (worker_id == 0) { |
|
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1028 // task 0 is responsible for clearing the global data structures |
|
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1029 // We should be here because of an overflow. During STW we should |
|
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1030 // not clear the overflow flag since we rely on it being true when |
|
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1031 // we exit this method to abort the pause and restart concurent |
|
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1032 // marking. |
|
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1033 reset_marking_state(true /* clear_overflow */); |
|
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1034 force_overflow()->update(); |
|
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1035 |
|
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1036 if (G1Log::fine()) { |
|
20190
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1037 gclog_or_tty->gclog_stamp(concurrent_gc_id()); |
|
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1038 gclog_or_tty->print_cr("[GC concurrent-mark-reset-for-overflow]"); |
|
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1039 } |
| 342 | 1040 } |
| 1041 } | |
| 1042 | |
| 1043 // after this, each task should reset its own data structures then | |
| 1044 // then go into the second barrier | |
| 1045 } | |
| 1046 | |
|
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1047 void ConcurrentMark::enter_second_sync_barrier(uint worker_id) { |
|
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1048 if (verbose_low()) { |
|
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1049 gclog_or_tty->print_cr("[%u] entering second barrier", worker_id); |
|
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1050 } |
| 342 | 1051 |
|
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1052 if (concurrent()) { |
| 20192 | 1053 SuspendibleThreadSet::leave(); |
|
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1054 } |
|
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1055 |
|
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1056 bool barrier_aborted = !_second_overflow_barrier_sync.enter(); |
|
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1057 |
|
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1058 if (concurrent()) { |
| 20192 | 1059 SuspendibleThreadSet::join(); |
|
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1060 } |
|
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1061 // at this point everything should be re-initialized and ready to go |
| 342 | 1062 |
|
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1063 if (verbose_low()) { |
|
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1064 if (barrier_aborted) { |
|
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1065 gclog_or_tty->print_cr("[%u] aborted second barrier", worker_id); |
|
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1066 } else { |
|
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1067 gclog_or_tty->print_cr("[%u] leaving second barrier", worker_id); |
|
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1068 } |
|
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1069 } |
| 342 | 1070 } |
| 1071 | |
|
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1072 #ifndef PRODUCT |
|
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|
1073 void ForceOverflowSettings::init() { |
|
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1074 _num_remaining = G1ConcMarkForceOverflow; |
|
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1075 _force = false; |
|
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1076 update(); |
|
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1077 } |
|
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1078 |
|
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1079 void ForceOverflowSettings::update() { |
|
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1080 if (_num_remaining > 0) { |
|
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1081 _num_remaining -= 1; |
|
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1082 _force = true; |
|
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1083 } else { |
|
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1084 _force = false; |
|
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1085 } |
|
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1086 } |
|
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|
1087 |
|
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|
1088 bool ForceOverflowSettings::should_force() { |
|
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1089 if (_force) { |
|
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1090 _force = false; |
|
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1091 return true; |
|
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1092 } else { |
|
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|
1093 return false; |
|
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1094 } |
|
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1095 } |
|
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1096 #endif // !PRODUCT |
|
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|
1097 |
| 342 | 1098 class CMConcurrentMarkingTask: public AbstractGangTask { |
| 1099 private: | |
| 1100 ConcurrentMark* _cm; | |
| 1101 ConcurrentMarkThread* _cmt; | |
| 1102 | |
| 1103 public: | |
|
4728
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|
1104 void work(uint worker_id) { |
|
1023
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|
1105 assert(Thread::current()->is_ConcurrentGC_thread(), |
|
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|
1106 "this should only be done by a conc GC thread"); |
|
1974
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|
1107 ResourceMark rm; |
| 342 | 1108 |
| 1109 double start_vtime = os::elapsedVTime(); | |
| 1110 | |
| 20192 | 1111 SuspendibleThreadSet::join(); |
| 342 | 1112 |
|
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|
1113 assert(worker_id < _cm->active_tasks(), "invariant"); |
|
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1114 CMTask* the_task = _cm->task(worker_id); |
| 342 | 1115 the_task->record_start_time(); |
| 1116 if (!_cm->has_aborted()) { | |
| 1117 do { | |
| 1118 double start_vtime_sec = os::elapsedVTime(); | |
| 1119 double start_time_sec = os::elapsedTime(); | |
|
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1120 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
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1121 |
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1122 the_task->do_marking_step(mark_step_duration_ms, |
|
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1123 true /* do_termination */, |
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1124 false /* is_serial*/); |
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1125 |
| 342 | 1126 double end_time_sec = os::elapsedTime(); |
| 1127 double end_vtime_sec = os::elapsedVTime(); | |
| 1128 double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; | |
| 1129 double elapsed_time_sec = end_time_sec - start_time_sec; | |
| 1130 _cm->clear_has_overflown(); | |
| 1131 | |
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1132 bool ret = _cm->do_yield_check(worker_id); |
| 342 | 1133 |
| 1134 jlong sleep_time_ms; | |
| 1135 if (!_cm->has_aborted() && the_task->has_aborted()) { | |
| 1136 sleep_time_ms = | |
| 1137 (jlong) (elapsed_vtime_sec * _cm->sleep_factor() * 1000.0); | |
| 20192 | 1138 SuspendibleThreadSet::leave(); |
| 342 | 1139 os::sleep(Thread::current(), sleep_time_ms, false); |
| 20192 | 1140 SuspendibleThreadSet::join(); |
| 342 | 1141 } |
| 1142 double end_time2_sec = os::elapsedTime(); | |
| 1143 double elapsed_time2_sec = end_time2_sec - start_time_sec; | |
| 1144 | |
| 1145 #if 0 | |
| 1146 gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " | |
| 1147 "overhead %1.4lf", | |
| 1148 elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, | |
| 1149 the_task->conc_overhead(os::elapsedTime()) * 8.0); | |
| 1150 gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", | |
| 1151 elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); | |
| 1152 #endif | |
| 1153 } while (!_cm->has_aborted() && the_task->has_aborted()); | |
| 1154 } | |
| 1155 the_task->record_end_time(); | |
|
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1156 guarantee(!the_task->has_aborted() || _cm->has_aborted(), "invariant"); |
| 342 | 1157 |
| 20192 | 1158 SuspendibleThreadSet::leave(); |
| 342 | 1159 |
| 1160 double end_vtime = os::elapsedVTime(); | |
|
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1161 _cm->update_accum_task_vtime(worker_id, end_vtime - start_vtime); |
| 342 | 1162 } |
| 1163 | |
| 1164 CMConcurrentMarkingTask(ConcurrentMark* cm, | |
| 1165 ConcurrentMarkThread* cmt) : | |
| 1166 AbstractGangTask("Concurrent Mark"), _cm(cm), _cmt(cmt) { } | |
| 1167 | |
| 1168 ~CMConcurrentMarkingTask() { } | |
| 1169 }; | |
| 1170 | |
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1171 // Calculates the number of active workers for a concurrent |
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1172 // phase. |
|
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1173 uint ConcurrentMark::calc_parallel_marking_threads() { |
| 4711 | 1174 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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1175 uint n_conc_workers = 0; |
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1176 if (!UseDynamicNumberOfGCThreads || |
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1177 (!FLAG_IS_DEFAULT(ConcGCThreads) && |
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1178 !ForceDynamicNumberOfGCThreads)) { |
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1179 n_conc_workers = max_parallel_marking_threads(); |
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1180 } else { |
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1181 n_conc_workers = |
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1182 AdaptiveSizePolicy::calc_default_active_workers( |
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1183 max_parallel_marking_threads(), |
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1184 1, /* Minimum workers */ |
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1185 parallel_marking_threads(), |
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1186 Threads::number_of_non_daemon_threads()); |
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1187 // Don't scale down "n_conc_workers" by scale_parallel_threads() because |
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1188 // that scaling has already gone into "_max_parallel_marking_threads". |
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1189 } |
| 4711 | 1190 assert(n_conc_workers > 0, "Always need at least 1"); |
| 1191 return n_conc_workers; | |
|
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1192 } |
| 4711 | 1193 // If we are not running with any parallel GC threads we will not |
| 1194 // have spawned any marking threads either. Hence the number of | |
| 1195 // concurrent workers should be 0. | |
| 1196 return 0; | |
|
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1197 } |
|
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1198 |
|
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1199 void ConcurrentMark::scanRootRegion(HeapRegion* hr, uint worker_id) { |
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1200 // Currently, only survivors can be root regions. |
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1201 assert(hr->next_top_at_mark_start() == hr->bottom(), "invariant"); |
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1202 G1RootRegionScanClosure cl(_g1h, this, worker_id); |
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1203 |
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1204 const uintx interval = PrefetchScanIntervalInBytes; |
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1205 HeapWord* curr = hr->bottom(); |
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1206 const HeapWord* end = hr->top(); |
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1207 while (curr < end) { |
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1208 Prefetch::read(curr, interval); |
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1209 oop obj = oop(curr); |
|
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1210 int size = obj->oop_iterate(&cl); |
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1211 assert(size == obj->size(), "sanity"); |
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1212 curr += size; |
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1213 } |
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1214 } |
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1215 |
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1216 class CMRootRegionScanTask : public AbstractGangTask { |
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1217 private: |
|
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1218 ConcurrentMark* _cm; |
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1219 |
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1220 public: |
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1221 CMRootRegionScanTask(ConcurrentMark* cm) : |
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1222 AbstractGangTask("Root Region Scan"), _cm(cm) { } |
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1223 |
|
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1224 void work(uint worker_id) { |
|
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1225 assert(Thread::current()->is_ConcurrentGC_thread(), |
|
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1226 "this should only be done by a conc GC thread"); |
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1227 |
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1228 CMRootRegions* root_regions = _cm->root_regions(); |
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1229 HeapRegion* hr = root_regions->claim_next(); |
|
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1230 while (hr != NULL) { |
|
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1231 _cm->scanRootRegion(hr, worker_id); |
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1232 hr = root_regions->claim_next(); |
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1233 } |
|
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1234 } |
|
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1235 }; |
|
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1236 |
|
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1237 void ConcurrentMark::scanRootRegions() { |
|
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1238 // Start of concurrent marking. |
|
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|
1239 ClassLoaderDataGraph::clear_claimed_marks(); |
|
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1240 |
|
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1241 // scan_in_progress() will have been set to true only if there was |
|
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1242 // at least one root region to scan. So, if it's false, we |
|
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1243 // should not attempt to do any further work. |
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1244 if (root_regions()->scan_in_progress()) { |
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1245 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1246 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1247 "Maximum number of marking threads exceeded"); |
|
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1248 uint active_workers = MAX2(1U, parallel_marking_threads()); |
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1249 |
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1250 CMRootRegionScanTask task(this); |
|
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1251 if (use_parallel_marking_threads()) { |
|
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1252 _parallel_workers->set_active_workers((int) active_workers); |
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1253 _parallel_workers->run_task(&task); |
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1254 } else { |
|
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1255 task.work(0); |
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1256 } |
|
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1257 |
|
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1258 // It's possible that has_aborted() is true here without actually |
|
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1259 // aborting the survivor scan earlier. This is OK as it's |
|
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1260 // mainly used for sanity checking. |
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1261 root_regions()->scan_finished(); |
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1262 } |
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1263 } |
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1264 |
| 342 | 1265 void ConcurrentMark::markFromRoots() { |
| 1266 // we might be tempted to assert that: | |
| 1267 // assert(asynch == !SafepointSynchronize::is_at_safepoint(), | |
| 1268 // "inconsistent argument?"); | |
| 1269 // However that wouldn't be right, because it's possible that | |
| 1270 // a safepoint is indeed in progress as a younger generation | |
| 1271 // stop-the-world GC happens even as we mark in this generation. | |
| 1272 | |
| 1273 _restart_for_overflow = false; | |
|
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|
1274 force_overflow_conc()->init(); |
|
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1275 |
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1276 // _g1h has _n_par_threads |
|
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1277 _parallel_marking_threads = calc_parallel_marking_threads(); |
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1278 assert(parallel_marking_threads() <= max_parallel_marking_threads(), |
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1279 "Maximum number of marking threads exceeded"); |
| 4711 | 1280 |
|
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1281 uint active_workers = MAX2(1U, parallel_marking_threads()); |
| 4711 | 1282 |
|
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1283 // Parallel task terminator is set in "set_concurrency_and_phase()" |
|
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1284 set_concurrency_and_phase(active_workers, true /* concurrent */); |
| 342 | 1285 |
| 1286 CMConcurrentMarkingTask markingTask(this, cmThread()); | |
|
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1287 if (use_parallel_marking_threads()) { |
| 4711 | 1288 _parallel_workers->set_active_workers((int)active_workers); |
|
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1289 // Don't set _n_par_threads because it affects MT in process_roots() |
| 4711 | 1290 // and the decisions on that MT processing is made elsewhere. |
| 1291 assert(_parallel_workers->active_workers() > 0, "Should have been set"); | |
| 342 | 1292 _parallel_workers->run_task(&markingTask); |
|
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1293 } else { |
| 342 | 1294 markingTask.work(0); |
|
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|
1295 } |
| 342 | 1296 print_stats(); |
| 1297 } | |
| 1298 | |
| 1299 void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) { | |
| 1300 // world is stopped at this checkpoint | |
| 1301 assert(SafepointSynchronize::is_at_safepoint(), | |
| 1302 "world should be stopped"); | |
|
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1303 |
| 342 | 1304 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 1305 | |
| 1306 // If a full collection has happened, we shouldn't do this. | |
| 1307 if (has_aborted()) { | |
| 1308 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 1309 return; | |
| 1310 } | |
| 1311 | |
|
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1312 SvcGCMarker sgcm(SvcGCMarker::OTHER); |
|
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1313 |
|
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1314 if (VerifyDuringGC) { |
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1315 HandleMark hm; // handle scope |
|
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1316 Universe::heap()->prepare_for_verify(); |
|
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1317 Universe::verify(VerifyOption_G1UsePrevMarking, |
|
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1318 " VerifyDuringGC:(before)"); |
|
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1319 } |
|
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1320 g1h->check_bitmaps("Remark Start"); |
|
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1321 |
| 342 | 1322 G1CollectorPolicy* g1p = g1h->g1_policy(); |
| 1323 g1p->record_concurrent_mark_remark_start(); | |
| 1324 | |
| 1325 double start = os::elapsedTime(); | |
| 1326 | |
| 1327 checkpointRootsFinalWork(); | |
| 1328 | |
| 1329 double mark_work_end = os::elapsedTime(); | |
| 1330 | |
| 1331 weakRefsWork(clear_all_soft_refs); | |
| 1332 | |
| 1333 if (has_overflown()) { | |
| 1334 // Oops. We overflowed. Restart concurrent marking. | |
| 1335 _restart_for_overflow = true; | |
|
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|
1336 if (G1TraceMarkStackOverflow) { |
|
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1337 gclog_or_tty->print_cr("\nRemark led to restart for overflow."); |
|
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|
1338 } |
|
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1339 |
|
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|
1340 // Verify the heap w.r.t. the previous marking bitmap. |
|
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1341 if (VerifyDuringGC) { |
|
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1342 HandleMark hm; // handle scope |
|
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1343 Universe::heap()->prepare_for_verify(); |
|
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1344 Universe::verify(VerifyOption_G1UsePrevMarking, |
|
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1345 " VerifyDuringGC:(overflow)"); |
|
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1346 } |
|
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1347 |
|
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1348 // Clear the marking state because we will be restarting |
|
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1349 // marking due to overflowing the global mark stack. |
|
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1350 reset_marking_state(); |
| 342 | 1351 } else { |
|
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1352 // Aggregate the per-task counting data that we have accumulated |
|
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1353 // while marking. |
|
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|
1354 aggregate_count_data(); |
|
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|
1355 |
| 2149 | 1356 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
| 342 | 1357 // We're done with marking. |
|
1317
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1358 // This is the end of the marking cycle, we're expected all |
|
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|
1359 // threads to have SATB queues with active set to true. |
| 2149 | 1360 satb_mq_set.set_active_all_threads(false, /* new active value */ |
| 1361 true /* expected_active */); | |
| 811 | 1362 |
| 1363 if (VerifyDuringGC) { | |
|
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|
1364 HandleMark hm; // handle scope |
|
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|
1365 Universe::heap()->prepare_for_verify(); |
|
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1366 Universe::verify(VerifyOption_G1UseNextMarking, |
|
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1367 " VerifyDuringGC:(after)"); |
| 811 | 1368 } |
|
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1369 g1h->check_bitmaps("Remark End"); |
|
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|
1370 assert(!restart_for_overflow(), "sanity"); |
|
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1371 // Completely reset the marking state since marking completed |
|
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1372 set_non_marking_state(); |
|
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1373 } |
|
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1374 |
|
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1375 // Expand the marking stack, if we have to and if we can. |
|
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1376 if (_markStack.should_expand()) { |
|
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|
1377 _markStack.expand(); |
|
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|
1378 } |
|
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|
1379 |
| 342 | 1380 // Statistics |
| 1381 double now = os::elapsedTime(); | |
| 1382 _remark_mark_times.add((mark_work_end - start) * 1000.0); | |
| 1383 _remark_weak_ref_times.add((now - mark_work_end) * 1000.0); | |
| 1384 _remark_times.add((now - start) * 1000.0); | |
| 1385 | |
| 1386 g1p->record_concurrent_mark_remark_end(); | |
| 10405 | 1387 |
| 1388 G1CMIsAliveClosure is_alive(g1h); | |
| 1389 g1h->gc_tracer_cm()->report_object_count_after_gc(&is_alive); | |
| 342 | 1390 } |
| 1391 | |
|
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|
1392 // Base class of the closures that finalize and verify the |
|
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1393 // liveness counting data. |
|
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|
1394 class CMCountDataClosureBase: public HeapRegionClosure { |
|
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|
1395 protected: |
|
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|
1396 G1CollectedHeap* _g1h; |
| 342 | 1397 ConcurrentMark* _cm; |
|
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|
1398 CardTableModRefBS* _ct_bs; |
|
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|
1399 |
| 342 | 1400 BitMap* _region_bm; |
| 1401 BitMap* _card_bm; | |
|
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1402 |
|
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|
1403 // Takes a region that's not empty (i.e., it has at least one |
| 829 | 1404 // live object in it and sets its corresponding bit on the region |
| 1405 // bitmap to 1. If the region is "starts humongous" it will also set | |
| 1406 // to 1 the bits on the region bitmap that correspond to its | |
| 1407 // associated "continues humongous" regions. | |
| 1408 void set_bit_for_region(HeapRegion* hr) { | |
| 1409 assert(!hr->continuesHumongous(), "should have filtered those out"); | |
| 1410 | |
|
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|
1411 BitMap::idx_t index = (BitMap::idx_t) hr->hrm_index(); |
| 829 | 1412 if (!hr->startsHumongous()) { |
| 1413 // Normal (non-humongous) case: just set the bit. | |
|
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|
1414 _region_bm->par_at_put(index, true); |
| 829 | 1415 } else { |
| 1416 // Starts humongous case: calculate how many regions are part of | |
|
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1417 // this humongous region and then set the bit range. |
|
6254
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|
1418 BitMap::idx_t end_index = (BitMap::idx_t) hr->last_hc_index(); |
|
6010
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|
1419 _region_bm->par_at_put_range(index, end_index, true); |
| 829 | 1420 } |
| 1421 } | |
| 1422 | |
|
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1423 public: |
|
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1424 CMCountDataClosureBase(G1CollectedHeap* g1h, |
|
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|
1425 BitMap* region_bm, BitMap* card_bm): |
|
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1426 _g1h(g1h), _cm(g1h->concurrent_mark()), |
|
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1427 _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
|
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1428 _region_bm(region_bm), _card_bm(card_bm) { } |
|
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1429 }; |
|
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1430 |
|
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|
1431 // Closure that calculates the # live objects per region. Used |
|
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1432 // for verification purposes during the cleanup pause. |
|
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|
1433 class CalcLiveObjectsClosure: public CMCountDataClosureBase { |
|
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|
1434 CMBitMapRO* _bm; |
|
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|
1435 size_t _region_marked_bytes; |
|
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1436 |
|
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1437 public: |
|
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1438 CalcLiveObjectsClosure(CMBitMapRO *bm, G1CollectedHeap* g1h, |
|
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1439 BitMap* region_bm, BitMap* card_bm) : |
|
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1440 CMCountDataClosureBase(g1h, region_bm, card_bm), |
|
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1441 _bm(bm), _region_marked_bytes(0) { } |
|
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1442 |
| 342 | 1443 bool doHeapRegion(HeapRegion* hr) { |
| 1444 | |
| 639 | 1445 if (hr->continuesHumongous()) { |
| 829 | 1446 // We will ignore these here and process them when their |
| 1447 // associated "starts humongous" region is processed (see | |
| 1448 // set_bit_for_heap_region()). Note that we cannot rely on their | |
| 1449 // associated "starts humongous" region to have their bit set to | |
| 1450 // 1 since, due to the region chunking in the parallel region | |
| 1451 // iteration, a "continues humongous" region might be visited | |
| 1452 // before its associated "starts humongous". | |
| 639 | 1453 return false; |
| 1454 } | |
| 342 | 1455 |
|
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1456 HeapWord* ntams = hr->next_top_at_mark_start(); |
|
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|
1457 HeapWord* start = hr->bottom(); |
|
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|
1458 |
|
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|
1459 assert(start <= hr->end() && start <= ntams && ntams <= hr->end(), |
|
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1460 err_msg("Preconditions not met - " |
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1461 "start: "PTR_FORMAT", ntams: "PTR_FORMAT", end: "PTR_FORMAT, |
|
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1462 p2i(start), p2i(ntams), p2i(hr->end()))); |
|
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1463 |
| 342 | 1464 // Find the first marked object at or after "start". |
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1465 start = _bm->getNextMarkedWordAddress(start, ntams); |
|
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1466 |
| 342 | 1467 size_t marked_bytes = 0; |
| 1468 | |
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1469 while (start < ntams) { |
| 342 | 1470 oop obj = oop(start); |
| 1471 int obj_sz = obj->size(); | |
|
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1472 HeapWord* obj_end = start + obj_sz; |
|
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1473 |
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1474 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(start); |
|
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1475 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(obj_end); |
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1476 |
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1477 // Note: if we're looking at the last region in heap - obj_end |
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1478 // could be actually just beyond the end of the heap; end_idx |
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1479 // will then correspond to a (non-existent) card that is also |
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1480 // just beyond the heap. |
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1481 if (_g1h->is_in_g1_reserved(obj_end) && !_ct_bs->is_card_aligned(obj_end)) { |
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1482 // end of object is not card aligned - increment to cover |
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1483 // all the cards spanned by the object |
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1484 end_idx += 1; |
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1485 } |
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1486 |
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1487 // Set the bits in the card BM for the cards spanned by this object. |
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1488 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
|
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1489 |
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1490 // Add the size of this object to the number of marked bytes. |
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1491 marked_bytes += (size_t)obj_sz * HeapWordSize; |
|
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1492 |
| 342 | 1493 // Find the next marked object after this one. |
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1494 start = _bm->getNextMarkedWordAddress(obj_end, ntams); |
|
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1495 } |
|
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1496 |
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1497 // Mark the allocated-since-marking portion... |
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1498 HeapWord* top = hr->top(); |
|
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1499 if (ntams < top) { |
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1500 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
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1501 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
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1502 |
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1503 // Note: if we're looking at the last region in heap - top |
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1504 // could be actually just beyond the end of the heap; end_idx |
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1505 // will then correspond to a (non-existent) card that is also |
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1506 // just beyond the heap. |
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1507 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
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1508 // end of object is not card aligned - increment to cover |
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1509 // all the cards spanned by the object |
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1510 end_idx += 1; |
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|
1511 } |
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|
1512 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
|
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1513 |
|
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1514 // This definitely means the region has live objects. |
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|
1515 set_bit_for_region(hr); |
| 342 | 1516 } |
| 1517 | |
| 1518 // Update the live region bitmap. | |
| 1519 if (marked_bytes > 0) { | |
| 829 | 1520 set_bit_for_region(hr); |
| 342 | 1521 } |
|
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1522 |
|
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1523 // Set the marked bytes for the current region so that |
|
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1524 // it can be queried by a calling verificiation routine |
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1525 _region_marked_bytes = marked_bytes; |
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1526 |
| 342 | 1527 return false; |
| 1528 } | |
| 1529 | |
|
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1530 size_t region_marked_bytes() const { return _region_marked_bytes; } |
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|
1531 }; |
|
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|
1532 |
|
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1533 // Heap region closure used for verifying the counting data |
|
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1534 // that was accumulated concurrently and aggregated during |
|
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1535 // the remark pause. This closure is applied to the heap |
|
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1536 // regions during the STW cleanup pause. |
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|
1537 |
|
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|
1538 class VerifyLiveObjectDataHRClosure: public HeapRegionClosure { |
|
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|
1539 G1CollectedHeap* _g1h; |
|
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|
1540 ConcurrentMark* _cm; |
|
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|
1541 CalcLiveObjectsClosure _calc_cl; |
|
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|
1542 BitMap* _region_bm; // Region BM to be verified |
|
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|
1543 BitMap* _card_bm; // Card BM to be verified |
|
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|
1544 bool _verbose; // verbose output? |
|
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|
1545 |
|
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|
1546 BitMap* _exp_region_bm; // Expected Region BM values |
|
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|
1547 BitMap* _exp_card_bm; // Expected card BM values |
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|
1548 |
|
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|
1549 int _failures; |
|
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|
1550 |
|
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|
1551 public: |
|
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|
1552 VerifyLiveObjectDataHRClosure(G1CollectedHeap* g1h, |
|
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|
1553 BitMap* region_bm, |
|
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|
1554 BitMap* card_bm, |
|
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|
1555 BitMap* exp_region_bm, |
|
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|
1556 BitMap* exp_card_bm, |
|
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|
1557 bool verbose) : |
|
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|
1558 _g1h(g1h), _cm(g1h->concurrent_mark()), |
|
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|
1559 _calc_cl(_cm->nextMarkBitMap(), g1h, exp_region_bm, exp_card_bm), |
|
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|
1560 _region_bm(region_bm), _card_bm(card_bm), _verbose(verbose), |
|
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|
1561 _exp_region_bm(exp_region_bm), _exp_card_bm(exp_card_bm), |
|
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|
1562 _failures(0) { } |
|
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|
1563 |
|
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|
1564 int failures() const { return _failures; } |
|
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|
1565 |
|
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|
1566 bool doHeapRegion(HeapRegion* hr) { |
|
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1567 if (hr->continuesHumongous()) { |
|
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|
1568 // We will ignore these here and process them when their |
|
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|
1569 // associated "starts humongous" region is processed (see |
|
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|
1570 // set_bit_for_heap_region()). Note that we cannot rely on their |
|
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|
1571 // associated "starts humongous" region to have their bit set to |
|
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|
1572 // 1 since, due to the region chunking in the parallel region |
|
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|
1573 // iteration, a "continues humongous" region might be visited |
|
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|
1574 // before its associated "starts humongous". |
|
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|
1575 return false; |
|
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|
1576 } |
|
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|
1577 |
|
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|
1578 int failures = 0; |
|
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|
1579 |
|
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|
1580 // Call the CalcLiveObjectsClosure to walk the marking bitmap for |
|
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|
1581 // this region and set the corresponding bits in the expected region |
|
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|
1582 // and card bitmaps. |
|
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|
1583 bool res = _calc_cl.doHeapRegion(hr); |
|
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|
1584 assert(res == false, "should be continuing"); |
|
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|
1585 |
|
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|
1586 MutexLockerEx x((_verbose ? ParGCRareEvent_lock : NULL), |
|
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|
1587 Mutex::_no_safepoint_check_flag); |
|
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|
1588 |
|
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|
1589 // Verify the marked bytes for this region. |
|
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|
1590 size_t exp_marked_bytes = _calc_cl.region_marked_bytes(); |
|
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|
1591 size_t act_marked_bytes = hr->next_marked_bytes(); |
|
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|
1592 |
|
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|
1593 // We're not OK if expected marked bytes > actual marked bytes. It means |
|
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|
1594 // we have missed accounting some objects during the actual marking. |
|
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|
1595 if (exp_marked_bytes > act_marked_bytes) { |
|
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|
1596 if (_verbose) { |
|
6010
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|
1597 gclog_or_tty->print_cr("Region %u: marked bytes mismatch: " |
|
4836
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|
1598 "expected: " SIZE_FORMAT ", actual: " SIZE_FORMAT, |
|
20377
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8054819: Rename HeapRegionSeq to HeapRegionManager
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|
1599 hr->hrm_index(), exp_marked_bytes, act_marked_bytes); |
|
4836
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|
1600 } |
|
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|
1601 failures += 1; |
|
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|
1602 } |
|
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|
1603 |
|
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|
1604 // Verify the bit, for this region, in the actual and expected |
|
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|
1605 // (which was just calculated) region bit maps. |
|
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|
1606 // We're not OK if the bit in the calculated expected region |
|
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|
1607 // bitmap is set and the bit in the actual region bitmap is not. |
|
20377
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8054819: Rename HeapRegionSeq to HeapRegionManager
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|
1608 BitMap::idx_t index = (BitMap::idx_t) hr->hrm_index(); |
|
4836
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|
1609 |
|
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|
1610 bool expected = _exp_region_bm->at(index); |
|
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|
1611 bool actual = _region_bm->at(index); |
|
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|
1612 if (expected && !actual) { |
|
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|
1613 if (_verbose) { |
|
6010
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|
1614 gclog_or_tty->print_cr("Region %u: region bitmap mismatch: " |
|
720b6a76dd9d
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|
1615 "expected: %s, actual: %s", |
|
20377
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8054819: Rename HeapRegionSeq to HeapRegionManager
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|
1616 hr->hrm_index(), |
|
6010
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|
1617 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
|
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|
1618 } |
|
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|
1619 failures += 1; |
|
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|
1620 } |
|
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|
1621 |
|
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|
1622 // Verify that the card bit maps for the cards spanned by the current |
|
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|
1623 // region match. We have an error if we have a set bit in the expected |
|
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|
1624 // bit map and the corresponding bit in the actual bitmap is not set. |
|
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|
1625 |
|
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|
1626 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(hr->bottom()); |
|
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|
1627 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(hr->top()); |
|
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|
1628 |
|
d30fa85f9994
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|
1629 for (BitMap::idx_t i = start_idx; i < end_idx; i+=1) { |
|
d30fa85f9994
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|
1630 expected = _exp_card_bm->at(i); |
|
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|
1631 actual = _card_bm->at(i); |
|
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|
1632 |
|
d30fa85f9994
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changeset
|
1633 if (expected && !actual) { |
|
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|
1634 if (_verbose) { |
|
6010
720b6a76dd9d
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diff
changeset
|
1635 gclog_or_tty->print_cr("Region %u: card bitmap mismatch at " SIZE_FORMAT ": " |
|
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
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parents:
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diff
changeset
|
1636 "expected: %s, actual: %s", |
|
20377
a8ea2f110d87
8054819: Rename HeapRegionSeq to HeapRegionManager
tschatzl
parents:
20337
diff
changeset
|
1637 hr->hrm_index(), i, |
|
6010
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diff
changeset
|
1638 BOOL_TO_STR(expected), BOOL_TO_STR(actual)); |
|
4836
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changeset
|
1639 } |
|
d30fa85f9994
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diff
changeset
|
1640 failures += 1; |
|
d30fa85f9994
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diff
changeset
|
1641 } |
|
d30fa85f9994
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diff
changeset
|
1642 } |
|
d30fa85f9994
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diff
changeset
|
1643 |
|
d30fa85f9994
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diff
changeset
|
1644 if (failures > 0 && _verbose) { |
|
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|
1645 gclog_or_tty->print_cr("Region " HR_FORMAT ", ntams: " PTR_FORMAT ", " |
|
d30fa85f9994
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changeset
|
1646 "marked_bytes: calc/actual " SIZE_FORMAT "/" SIZE_FORMAT, |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
1647 HR_FORMAT_PARAMS(hr), p2i(hr->next_top_at_mark_start()), |
|
4836
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|
1648 _calc_cl.region_marked_bytes(), hr->next_marked_bytes()); |
|
d30fa85f9994
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|
1649 } |
|
d30fa85f9994
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diff
changeset
|
1650 |
|
d30fa85f9994
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diff
changeset
|
1651 _failures += failures; |
|
d30fa85f9994
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diff
changeset
|
1652 |
|
d30fa85f9994
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parents:
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diff
changeset
|
1653 // We could stop iteration over the heap when we |
|
6027
8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
johnc
parents:
6011
diff
changeset
|
1654 // find the first violating region by returning true. |
|
4836
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|
1655 return false; |
|
d30fa85f9994
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|
1656 } |
| 342 | 1657 }; |
| 1658 | |
|
4836
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|
1659 class G1ParVerifyFinalCountTask: public AbstractGangTask { |
|
d30fa85f9994
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diff
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|
1660 protected: |
|
d30fa85f9994
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diff
changeset
|
1661 G1CollectedHeap* _g1h; |
|
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|
1662 ConcurrentMark* _cm; |
|
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|
1663 BitMap* _actual_region_bm; |
|
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|
1664 BitMap* _actual_card_bm; |
|
d30fa85f9994
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diff
changeset
|
1665 |
|
d30fa85f9994
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diff
changeset
|
1666 uint _n_workers; |
|
d30fa85f9994
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diff
changeset
|
1667 |
|
d30fa85f9994
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diff
changeset
|
1668 BitMap* _expected_region_bm; |
|
d30fa85f9994
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changeset
|
1669 BitMap* _expected_card_bm; |
|
d30fa85f9994
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diff
changeset
|
1670 |
|
d30fa85f9994
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diff
changeset
|
1671 int _failures; |
|
d30fa85f9994
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4830
diff
changeset
|
1672 bool _verbose; |
|
d30fa85f9994
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4830
diff
changeset
|
1673 |
|
d30fa85f9994
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4830
diff
changeset
|
1674 public: |
|
d30fa85f9994
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4830
diff
changeset
|
1675 G1ParVerifyFinalCountTask(G1CollectedHeap* g1h, |
|
d30fa85f9994
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4830
diff
changeset
|
1676 BitMap* region_bm, BitMap* card_bm, |
|
d30fa85f9994
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diff
changeset
|
1677 BitMap* expected_region_bm, BitMap* expected_card_bm) |
|
d30fa85f9994
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diff
changeset
|
1678 : AbstractGangTask("G1 verify final counting"), |
|
d30fa85f9994
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diff
changeset
|
1679 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
|
d30fa85f9994
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diff
changeset
|
1680 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
|
d30fa85f9994
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diff
changeset
|
1681 _expected_region_bm(expected_region_bm), _expected_card_bm(expected_card_bm), |
|
d30fa85f9994
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diff
changeset
|
1682 _failures(0), _verbose(false), |
|
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diff
changeset
|
1683 _n_workers(0) { |
|
d30fa85f9994
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diff
changeset
|
1684 assert(VerifyDuringGC, "don't call this otherwise"); |
|
d30fa85f9994
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4830
diff
changeset
|
1685 |
|
d30fa85f9994
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diff
changeset
|
1686 // Use the value already set as the number of active threads |
|
d30fa85f9994
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diff
changeset
|
1687 // in the call to run_task(). |
|
d30fa85f9994
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diff
changeset
|
1688 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
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diff
changeset
|
1689 assert( _g1h->workers()->active_workers() > 0, |
|
d30fa85f9994
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diff
changeset
|
1690 "Should have been previously set"); |
|
d30fa85f9994
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diff
changeset
|
1691 _n_workers = _g1h->workers()->active_workers(); |
|
d30fa85f9994
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parents:
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diff
changeset
|
1692 } else { |
|
d30fa85f9994
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diff
changeset
|
1693 _n_workers = 1; |
|
d30fa85f9994
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diff
changeset
|
1694 } |
|
d30fa85f9994
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diff
changeset
|
1695 |
|
d30fa85f9994
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diff
changeset
|
1696 assert(_expected_card_bm->size() == _actual_card_bm->size(), "sanity"); |
|
d30fa85f9994
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diff
changeset
|
1697 assert(_expected_region_bm->size() == _actual_region_bm->size(), "sanity"); |
|
d30fa85f9994
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diff
changeset
|
1698 |
|
d30fa85f9994
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diff
changeset
|
1699 _verbose = _cm->verbose_medium(); |
|
d30fa85f9994
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diff
changeset
|
1700 } |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
1701 |
|
d30fa85f9994
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parents:
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diff
changeset
|
1702 void work(uint worker_id) { |
|
d30fa85f9994
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4830
diff
changeset
|
1703 assert(worker_id < _n_workers, "invariant"); |
|
d30fa85f9994
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4830
diff
changeset
|
1704 |
|
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
1705 VerifyLiveObjectDataHRClosure verify_cl(_g1h, |
|
4836
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diff
changeset
|
1706 _actual_region_bm, _actual_card_bm, |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
1707 _expected_region_bm, |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
1708 _expected_card_bm, |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
1709 _verbose); |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
1710 |
|
d30fa85f9994
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parents:
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diff
changeset
|
1711 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
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parents:
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diff
changeset
|
1712 _g1h->heap_region_par_iterate_chunked(&verify_cl, |
|
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|
1713 worker_id, |
|
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|
1714 _n_workers, |
|
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|
1715 HeapRegion::VerifyCountClaimValue); |
|
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|
1716 } else { |
|
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|
1717 _g1h->heap_region_iterate(&verify_cl); |
|
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|
1718 } |
|
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|
1719 |
|
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|
1720 Atomic::add(verify_cl.failures(), &_failures); |
|
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|
1721 } |
|
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|
1722 |
|
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|
1723 int failures() const { return _failures; } |
|
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1724 }; |
|
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|
1725 |
|
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1726 // Closure that finalizes the liveness counting data. |
|
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1727 // Used during the cleanup pause. |
|
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1728 // Sets the bits corresponding to the interval [NTAMS, top] |
|
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1729 // (which contains the implicitly live objects) in the |
|
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1730 // card liveness bitmap. Also sets the bit for each region, |
|
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1731 // containing live data, in the region liveness bitmap. |
|
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1732 |
|
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1733 class FinalCountDataUpdateClosure: public CMCountDataClosureBase { |
|
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1734 public: |
|
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1735 FinalCountDataUpdateClosure(G1CollectedHeap* g1h, |
|
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1736 BitMap* region_bm, |
|
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1737 BitMap* card_bm) : |
|
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1738 CMCountDataClosureBase(g1h, region_bm, card_bm) { } |
|
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1739 |
|
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1740 bool doHeapRegion(HeapRegion* hr) { |
|
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1741 |
|
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|
1742 if (hr->continuesHumongous()) { |
|
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1743 // We will ignore these here and process them when their |
|
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1744 // associated "starts humongous" region is processed (see |
|
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1745 // set_bit_for_heap_region()). Note that we cannot rely on their |
|
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1746 // associated "starts humongous" region to have their bit set to |
|
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1747 // 1 since, due to the region chunking in the parallel region |
|
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1748 // iteration, a "continues humongous" region might be visited |
|
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1749 // before its associated "starts humongous". |
|
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|
1750 return false; |
|
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|
1751 } |
|
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|
1752 |
|
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|
1753 HeapWord* ntams = hr->next_top_at_mark_start(); |
|
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1754 HeapWord* top = hr->top(); |
|
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1755 |
|
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1756 assert(hr->bottom() <= ntams && ntams <= hr->end(), "Preconditions."); |
|
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1757 |
|
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|
1758 // Mark the allocated-since-marking portion... |
|
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|
1759 if (ntams < top) { |
|
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|
1760 // This definitely means the region has live objects. |
|
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|
1761 set_bit_for_region(hr); |
|
6812
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|
1762 |
|
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|
1763 // Now set the bits in the card bitmap for [ntams, top) |
|
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|
1764 BitMap::idx_t start_idx = _cm->card_bitmap_index_for(ntams); |
|
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|
1765 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(top); |
|
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|
1766 |
|
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changeset
|
1767 // Note: if we're looking at the last region in heap - top |
|
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|
1768 // could be actually just beyond the end of the heap; end_idx |
|
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|
1769 // will then correspond to a (non-existent) card that is also |
|
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|
1770 // just beyond the heap. |
|
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|
1771 if (_g1h->is_in_g1_reserved(top) && !_ct_bs->is_card_aligned(top)) { |
|
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|
1772 // end of object is not card aligned - increment to cover |
|
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|
1773 // all the cards spanned by the object |
|
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|
1774 end_idx += 1; |
|
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|
1775 } |
|
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changeset
|
1776 |
|
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changeset
|
1777 assert(end_idx <= _card_bm->size(), |
|
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|
1778 err_msg("oob: end_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
|
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changeset
|
1779 end_idx, _card_bm->size())); |
|
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|
1780 assert(start_idx < _card_bm->size(), |
|
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|
1781 err_msg("oob: start_idx= "SIZE_FORMAT", bitmap size= "SIZE_FORMAT, |
|
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changeset
|
1782 start_idx, _card_bm->size())); |
|
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changeset
|
1783 |
|
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changeset
|
1784 _cm->set_card_bitmap_range(_card_bm, start_idx, end_idx, true /* is_par */); |
|
6725
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|
1785 } |
|
4836
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|
1786 |
|
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|
1787 // Set the bit for the region if it contains live data |
|
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1788 if (hr->next_marked_bytes() > 0) { |
|
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|
1789 set_bit_for_region(hr); |
|
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|
1790 } |
|
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|
1791 |
|
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|
1792 return false; |
|
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diff
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|
1793 } |
|
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|
1794 }; |
| 342 | 1795 |
| 1796 class G1ParFinalCountTask: public AbstractGangTask { | |
| 1797 protected: | |
| 1798 G1CollectedHeap* _g1h; | |
|
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|
1799 ConcurrentMark* _cm; |
|
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|
1800 BitMap* _actual_region_bm; |
|
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|
1801 BitMap* _actual_card_bm; |
|
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|
1802 |
|
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|
1803 uint _n_workers; |
|
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1804 |
| 342 | 1805 public: |
|
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1806 G1ParFinalCountTask(G1CollectedHeap* g1h, BitMap* region_bm, BitMap* card_bm) |
|
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|
1807 : AbstractGangTask("G1 final counting"), |
|
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1808 _g1h(g1h), _cm(_g1h->concurrent_mark()), |
|
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1809 _actual_region_bm(region_bm), _actual_card_bm(card_bm), |
|
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1810 _n_workers(0) { |
|
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|
1811 // Use the value already set as the number of active threads |
| 6011 | 1812 // in the call to run_task(). |
|
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|
1813 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
1814 assert( _g1h->workers()->active_workers() > 0, |
|
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|
1815 "Should have been previously set"); |
|
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|
1816 _n_workers = _g1h->workers()->active_workers(); |
|
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|
1817 } else { |
| 342 | 1818 _n_workers = 1; |
|
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|
1819 } |
| 342 | 1820 } |
| 1821 | |
|
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1822 void work(uint worker_id) { |
|
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|
1823 assert(worker_id < _n_workers, "invariant"); |
|
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|
1824 |
|
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|
1825 FinalCountDataUpdateClosure final_update_cl(_g1h, |
|
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|
1826 _actual_region_bm, |
|
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|
1827 _actual_card_bm); |
|
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|
1828 |
|
1833
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diff
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|
1829 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
1830 _g1h->heap_region_par_iterate_chunked(&final_update_cl, |
|
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|
1831 worker_id, |
|
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|
1832 _n_workers, |
| 355 | 1833 HeapRegion::FinalCountClaimValue); |
| 342 | 1834 } else { |
|
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|
1835 _g1h->heap_region_iterate(&final_update_cl); |
| 342 | 1836 } |
| 1837 } | |
| 1838 }; | |
| 1839 | |
| 1840 class G1ParNoteEndTask; | |
| 1841 | |
| 1842 class G1NoteEndOfConcMarkClosure : public HeapRegionClosure { | |
| 1843 G1CollectedHeap* _g1; | |
| 1844 size_t _max_live_bytes; | |
|
6010
720b6a76dd9d
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|
1845 uint _regions_claimed; |
| 342 | 1846 size_t _freed_bytes; |
| 2173 | 1847 FreeRegionList* _local_cleanup_list; |
|
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|
1848 HeapRegionSetCount _old_regions_removed; |
|
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1849 HeapRegionSetCount _humongous_regions_removed; |
| 2173 | 1850 HRRSCleanupTask* _hrrs_cleanup_task; |
| 342 | 1851 double _claimed_region_time; |
| 1852 double _max_region_time; | |
| 1853 | |
| 1854 public: | |
| 1855 G1NoteEndOfConcMarkClosure(G1CollectedHeap* g1, | |
| 2173 | 1856 FreeRegionList* local_cleanup_list, |
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1857 HRRSCleanupTask* hrrs_cleanup_task) : |
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1858 _g1(g1), |
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1859 _max_live_bytes(0), _regions_claimed(0), |
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1860 _freed_bytes(0), |
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1861 _claimed_region_time(0.0), _max_region_time(0.0), |
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1862 _local_cleanup_list(local_cleanup_list), |
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1863 _old_regions_removed(), |
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1864 _humongous_regions_removed(), |
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1865 _hrrs_cleanup_task(hrrs_cleanup_task) { } |
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1866 |
| 342 | 1867 size_t freed_bytes() { return _freed_bytes; } |
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1868 const HeapRegionSetCount& old_regions_removed() { return _old_regions_removed; } |
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1869 const HeapRegionSetCount& humongous_regions_removed() { return _humongous_regions_removed; } |
| 342 | 1870 |
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1871 bool doHeapRegion(HeapRegion *hr) { |
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1872 if (hr->continuesHumongous()) { |
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1873 return false; |
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1874 } |
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1875 // We use a claim value of zero here because all regions |
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1876 // were claimed with value 1 in the FinalCount task. |
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1877 _g1->reset_gc_time_stamps(hr); |
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1878 double start = os::elapsedTime(); |
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1879 _regions_claimed++; |
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1880 hr->note_end_of_marking(); |
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1881 _max_live_bytes += hr->max_live_bytes(); |
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1882 |
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1883 if (hr->used() > 0 && hr->max_live_bytes() == 0 && !hr->is_young()) { |
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1884 _freed_bytes += hr->used(); |
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1885 hr->set_containing_set(NULL); |
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1886 if (hr->isHumongous()) { |
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1887 assert(hr->startsHumongous(), "we should only see starts humongous"); |
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1888 _humongous_regions_removed.increment(1u, hr->capacity()); |
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1889 _g1->free_humongous_region(hr, _local_cleanup_list, true); |
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1890 } else { |
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1891 _old_regions_removed.increment(1u, hr->capacity()); |
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1892 _g1->free_region(hr, _local_cleanup_list, true); |
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1893 } |
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1894 } else { |
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1895 hr->rem_set()->do_cleanup_work(_hrrs_cleanup_task); |
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1896 } |
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1897 |
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1898 double region_time = (os::elapsedTime() - start); |
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1899 _claimed_region_time += region_time; |
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1900 if (region_time > _max_region_time) { |
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1901 _max_region_time = region_time; |
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1902 } |
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1903 return false; |
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1904 } |
| 342 | 1905 |
| 1906 size_t max_live_bytes() { return _max_live_bytes; } | |
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1907 uint regions_claimed() { return _regions_claimed; } |
| 342 | 1908 double claimed_region_time_sec() { return _claimed_region_time; } |
| 1909 double max_region_time_sec() { return _max_region_time; } | |
| 1910 }; | |
| 1911 | |
| 1912 class G1ParNoteEndTask: public AbstractGangTask { | |
| 1913 friend class G1NoteEndOfConcMarkClosure; | |
| 2152 | 1914 |
| 342 | 1915 protected: |
| 1916 G1CollectedHeap* _g1h; | |
| 1917 size_t _max_live_bytes; | |
| 1918 size_t _freed_bytes; | |
| 2152 | 1919 FreeRegionList* _cleanup_list; |
| 1920 | |
| 342 | 1921 public: |
| 1922 G1ParNoteEndTask(G1CollectedHeap* g1h, | |
| 2152 | 1923 FreeRegionList* cleanup_list) : |
| 342 | 1924 AbstractGangTask("G1 note end"), _g1h(g1h), |
| 2152 | 1925 _max_live_bytes(0), _freed_bytes(0), _cleanup_list(cleanup_list) { } |
| 342 | 1926 |
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1927 void work(uint worker_id) { |
| 342 | 1928 double start = os::elapsedTime(); |
| 2173 | 1929 FreeRegionList local_cleanup_list("Local Cleanup List"); |
| 1930 HRRSCleanupTask hrrs_cleanup_task; | |
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1931 G1NoteEndOfConcMarkClosure g1_note_end(_g1h, &local_cleanup_list, |
| 2173 | 1932 &hrrs_cleanup_task); |
|
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1933 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1934 _g1h->heap_region_par_iterate_chunked(&g1_note_end, worker_id, |
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1935 _g1h->workers()->active_workers(), |
| 355 | 1936 HeapRegion::NoteEndClaimValue); |
| 342 | 1937 } else { |
| 1938 _g1h->heap_region_iterate(&g1_note_end); | |
| 1939 } | |
| 1940 assert(g1_note_end.complete(), "Shouldn't have yielded!"); | |
| 1941 | |
| 2152 | 1942 // Now update the lists |
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1943 _g1h->remove_from_old_sets(g1_note_end.old_regions_removed(), g1_note_end.humongous_regions_removed()); |
| 342 | 1944 { |
| 1945 MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag); | |
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1946 _g1h->decrement_summary_bytes(g1_note_end.freed_bytes()); |
| 342 | 1947 _max_live_bytes += g1_note_end.max_live_bytes(); |
| 1948 _freed_bytes += g1_note_end.freed_bytes(); | |
| 2152 | 1949 |
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1950 // If we iterate over the global cleanup list at the end of |
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1951 // cleanup to do this printing we will not guarantee to only |
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1952 // generate output for the newly-reclaimed regions (the list |
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1953 // might not be empty at the beginning of cleanup; we might |
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1954 // still be working on its previous contents). So we do the |
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1955 // printing here, before we append the new regions to the global |
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1956 // cleanup list. |
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1957 |
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1958 G1HRPrinter* hr_printer = _g1h->hr_printer(); |
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1959 if (hr_printer->is_active()) { |
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1960 FreeRegionListIterator iter(&local_cleanup_list); |
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1961 while (iter.more_available()) { |
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1962 HeapRegion* hr = iter.get_next(); |
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1963 hr_printer->cleanup(hr); |
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1964 } |
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1965 } |
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1966 |
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1967 _cleanup_list->add_ordered(&local_cleanup_list); |
| 2173 | 1968 assert(local_cleanup_list.is_empty(), "post-condition"); |
| 1969 | |
| 1970 HeapRegionRemSet::finish_cleanup_task(&hrrs_cleanup_task); | |
| 342 | 1971 } |
| 1972 } | |
| 1973 size_t max_live_bytes() { return _max_live_bytes; } | |
| 1974 size_t freed_bytes() { return _freed_bytes; } | |
| 1975 }; | |
| 1976 | |
| 1977 class G1ParScrubRemSetTask: public AbstractGangTask { | |
| 1978 protected: | |
| 1979 G1RemSet* _g1rs; | |
| 1980 BitMap* _region_bm; | |
| 1981 BitMap* _card_bm; | |
| 1982 public: | |
| 1983 G1ParScrubRemSetTask(G1CollectedHeap* g1h, | |
| 1984 BitMap* region_bm, BitMap* card_bm) : | |
| 1985 AbstractGangTask("G1 ScrubRS"), _g1rs(g1h->g1_rem_set()), | |
|
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1986 _region_bm(region_bm), _card_bm(card_bm) { } |
| 342 | 1987 |
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1988 void work(uint worker_id) { |
|
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1989 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1990 _g1rs->scrub_par(_region_bm, _card_bm, worker_id, |
| 355 | 1991 HeapRegion::ScrubRemSetClaimValue); |
| 342 | 1992 } else { |
| 1993 _g1rs->scrub(_region_bm, _card_bm); | |
| 1994 } | |
| 1995 } | |
| 1996 | |
| 1997 }; | |
| 1998 | |
| 1999 void ConcurrentMark::cleanup() { | |
| 2000 // world is stopped at this checkpoint | |
| 2001 assert(SafepointSynchronize::is_at_safepoint(), | |
| 2002 "world should be stopped"); | |
| 2003 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 2004 | |
| 2005 // If a full collection has happened, we shouldn't do this. | |
| 2006 if (has_aborted()) { | |
| 2007 g1h->set_marking_complete(); // So bitmap clearing isn't confused | |
| 2008 return; | |
| 2009 } | |
| 2010 | |
| 2152 | 2011 g1h->verify_region_sets_optional(); |
| 2012 | |
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2013 if (VerifyDuringGC) { |
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2014 HandleMark hm; // handle scope |
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2015 Universe::heap()->prepare_for_verify(); |
|
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2016 Universe::verify(VerifyOption_G1UsePrevMarking, |
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2017 " VerifyDuringGC:(before)"); |
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2018 } |
|
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2019 g1h->check_bitmaps("Cleanup Start"); |
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2020 |
| 342 | 2021 G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy(); |
| 2022 g1p->record_concurrent_mark_cleanup_start(); | |
| 2023 | |
| 2024 double start = os::elapsedTime(); | |
| 2025 | |
| 2173 | 2026 HeapRegionRemSet::reset_for_cleanup_tasks(); |
| 2027 | |
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2028 uint n_workers; |
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2029 |
| 342 | 2030 // Do counting once more with the world stopped for good measure. |
|
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2031 G1ParFinalCountTask g1_par_count_task(g1h, &_region_bm, &_card_bm); |
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2032 |
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2033 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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2034 assert(g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
| 355 | 2035 "sanity check"); |
| 2036 | |
| 4711 | 2037 g1h->set_par_threads(); |
| 2038 n_workers = g1h->n_par_threads(); | |
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|
2039 assert(g1h->n_par_threads() == n_workers, |
| 4711 | 2040 "Should not have been reset"); |
| 342 | 2041 g1h->workers()->run_task(&g1_par_count_task); |
|
4095
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|
2042 // Done with the parallel phase so reset to 0. |
| 342 | 2043 g1h->set_par_threads(0); |
| 355 | 2044 |
|
4836
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diff
changeset
|
2045 assert(g1h->check_heap_region_claim_values(HeapRegion::FinalCountClaimValue), |
| 355 | 2046 "sanity check"); |
| 342 | 2047 } else { |
| 4711 | 2048 n_workers = 1; |
| 342 | 2049 g1_par_count_task.work(0); |
| 2050 } | |
| 2051 | |
|
4836
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parents:
4830
diff
changeset
|
2052 if (VerifyDuringGC) { |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
2053 // Verify that the counting data accumulated during marking matches |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
2054 // that calculated by walking the marking bitmap. |
|
d30fa85f9994
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diff
changeset
|
2055 |
|
d30fa85f9994
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diff
changeset
|
2056 // Bitmaps to hold expected values |
|
20263
4dfab3faf5e7
8037958: ConcurrentMark::cleanup leaks BitMaps if VerifyDuringGC is enabled
mgerdin
parents:
20221
diff
changeset
|
2057 BitMap expected_region_bm(_region_bm.size(), true); |
|
4dfab3faf5e7
8037958: ConcurrentMark::cleanup leaks BitMaps if VerifyDuringGC is enabled
mgerdin
parents:
20221
diff
changeset
|
2058 BitMap expected_card_bm(_card_bm.size(), true); |
|
4836
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changeset
|
2059 |
|
d30fa85f9994
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diff
changeset
|
2060 G1ParVerifyFinalCountTask g1_par_verify_task(g1h, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2061 &_region_bm, |
|
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
2062 &_card_bm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2063 &expected_region_bm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2064 &expected_card_bm); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
2065 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
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diff
changeset
|
2066 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
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parents:
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changeset
|
2067 g1h->set_par_threads((int)n_workers); |
|
d30fa85f9994
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changeset
|
2068 g1h->workers()->run_task(&g1_par_verify_task); |
|
d30fa85f9994
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parents:
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changeset
|
2069 // Done with the parallel phase so reset to 0. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
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diff
changeset
|
2070 g1h->set_par_threads(0); |
|
d30fa85f9994
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parents:
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|
2071 |
|
d30fa85f9994
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parents:
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diff
changeset
|
2072 assert(g1h->check_heap_region_claim_values(HeapRegion::VerifyCountClaimValue), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
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changeset
|
2073 "sanity check"); |
|
d30fa85f9994
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parents:
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changeset
|
2074 } else { |
|
d30fa85f9994
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diff
changeset
|
2075 g1_par_verify_task.work(0); |
|
d30fa85f9994
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parents:
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diff
changeset
|
2076 } |
|
d30fa85f9994
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johnc
parents:
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diff
changeset
|
2077 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
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diff
changeset
|
2078 guarantee(g1_par_verify_task.failures() == 0, "Unexpected accounting failures"); |
|
d30fa85f9994
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parents:
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changeset
|
2079 } |
|
d30fa85f9994
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changeset
|
2080 |
| 342 | 2081 size_t start_used_bytes = g1h->used(); |
| 2082 g1h->set_marking_complete(); | |
| 2083 | |
| 2084 double count_end = os::elapsedTime(); | |
| 2085 double this_final_counting_time = (count_end - start); | |
| 2086 _total_counting_time += this_final_counting_time; | |
| 2087 | |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
2088 if (G1PrintRegionLivenessInfo) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
2089 G1PrintRegionLivenessInfoClosure cl(gclog_or_tty, "Post-Marking"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
2090 _g1h->heap_region_iterate(&cl); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
2091 } |
|
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
|
2092 |
| 342 | 2093 // Install newly created mark bitMap as "prev". |
| 2094 swapMarkBitMaps(); | |
| 2095 | |
| 2096 g1h->reset_gc_time_stamp(); | |
| 2097 | |
| 2098 // Note end of marking in all heap regions. | |
| 2152 | 2099 G1ParNoteEndTask g1_par_note_end_task(g1h, &_cleanup_list); |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
2100 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4095
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jmasa
parents:
4093
diff
changeset
|
2101 g1h->set_par_threads((int)n_workers); |
| 342 | 2102 g1h->workers()->run_task(&g1_par_note_end_task); |
| 2103 g1h->set_par_threads(0); | |
| 355 | 2104 |
| 2105 assert(g1h->check_heap_region_claim_values(HeapRegion::NoteEndClaimValue), | |
| 2106 "sanity check"); | |
| 342 | 2107 } else { |
| 2108 g1_par_note_end_task.work(0); | |
| 2109 } | |
|
6254
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6220
diff
changeset
|
2110 g1h->check_gc_time_stamps(); |
| 2152 | 2111 |
| 2112 if (!cleanup_list_is_empty()) { | |
| 2113 // The cleanup list is not empty, so we'll have to process it | |
| 2114 // concurrently. Notify anyone else that might be wanting free | |
| 2115 // regions that there will be more free regions coming soon. | |
| 2116 g1h->set_free_regions_coming(); | |
| 2117 } | |
| 342 | 2118 |
| 2119 // call below, since it affects the metric by which we sort the heap | |
| 2120 // regions. | |
| 2121 if (G1ScrubRemSets) { | |
| 2122 double rs_scrub_start = os::elapsedTime(); | |
| 2123 G1ParScrubRemSetTask g1_par_scrub_rs_task(g1h, &_region_bm, &_card_bm); | |
|
1833
8b10f48633dc
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
1719
diff
changeset
|
2124 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4093
diff
changeset
|
2125 g1h->set_par_threads((int)n_workers); |
| 342 | 2126 g1h->workers()->run_task(&g1_par_scrub_rs_task); |
| 2127 g1h->set_par_threads(0); | |
| 355 | 2128 |
| 2129 assert(g1h->check_heap_region_claim_values( | |
| 2130 HeapRegion::ScrubRemSetClaimValue), | |
| 2131 "sanity check"); | |
| 342 | 2132 } else { |
| 2133 g1_par_scrub_rs_task.work(0); | |
| 2134 } | |
| 2135 | |
| 2136 double rs_scrub_end = os::elapsedTime(); | |
| 2137 double this_rs_scrub_time = (rs_scrub_end - rs_scrub_start); | |
| 2138 _total_rs_scrub_time += this_rs_scrub_time; | |
| 2139 } | |
| 2140 | |
| 2141 // this will also free any regions totally full of garbage objects, | |
| 2142 // and sort the regions. | |
|
4095
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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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parents:
4093
diff
changeset
|
2143 g1h->g1_policy()->record_concurrent_mark_cleanup_end((int)n_workers); |
| 342 | 2144 |
| 2145 // Statistics. | |
| 2146 double end = os::elapsedTime(); | |
| 2147 _cleanup_times.add((end - start) * 1000.0); | |
| 2148 | |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5988
diff
changeset
|
2149 if (G1Log::fine()) { |
| 342 | 2150 g1h->print_size_transition(gclog_or_tty, |
| 2151 start_used_bytes, | |
| 2152 g1h->used(), | |
| 2153 g1h->capacity()); | |
| 2154 } | |
| 2155 | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2156 // Clean up will have freed any regions completely full of garbage. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2157 // Update the soft reference policy with the new heap occupancy. |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2158 Universe::update_heap_info_at_gc(); |
|
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2159 |
| 751 | 2160 if (VerifyDuringGC) { |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2161 HandleMark hm; // handle scope |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
831
diff
changeset
|
2162 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
|
2163 Universe::verify(VerifyOption_G1UsePrevMarking, |
|
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
9076
diff
changeset
|
2164 " VerifyDuringGC:(after)"); |
| 342 | 2165 } |
|
20291
e0954897238a
7132678: G1: verify that the marking bitmaps have no marks for objects over TAMS
brutisso
parents:
20282
diff
changeset
|
2166 g1h->check_bitmaps("Cleanup End"); |
| 2152 | 2167 |
| 2168 g1h->verify_region_sets_optional(); | |
|
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2169 |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2170 // 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
|
2171 // 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
|
2172 g1h->increment_total_collections(); |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2173 |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2174 // 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
|
2175 if (ClassUnloadingWithConcurrentMark) { |
|
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2176 ClassLoaderDataGraph::purge(); |
|
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2177 } |
|
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2178 MetaspaceGC::compute_new_size(); |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2179 |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2180 // 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:
20263
diff
changeset
|
2181 // sure we update the old gen/space data. |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2182 g1h->g1mm()->update_sizes(); |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2183 |
| 10405 | 2184 g1h->trace_heap_after_concurrent_cycle(); |
| 342 | 2185 } |
| 2186 | |
| 2187 void ConcurrentMark::completeCleanup() { | |
| 2188 if (has_aborted()) return; | |
| 2189 | |
| 2152 | 2190 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 2191 | |
|
17841
14bd75c9dbfa
8039089: List verification enabled in product builds
jwilhelm
parents:
17773
diff
changeset
|
2192 _cleanup_list.verify_optional(); |
| 2361 | 2193 FreeRegionList tmp_free_list("Tmp Free List"); |
| 2152 | 2194 |
| 2195 if (G1ConcRegionFreeingVerbose) { | |
| 2196 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
|
2197 "cleanup list has %u entries", |
| 2152 | 2198 _cleanup_list.length()); |
| 2199 } | |
| 2200 | |
| 20337 | 2201 // No one else should be accessing the _cleanup_list at this point, |
| 2202 // so it is not necessary to take any locks | |
| 2152 | 2203 while (!_cleanup_list.is_empty()) { |
|
20336
6701abbc4441
8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data
tschatzl
parents:
20335
diff
changeset
|
2204 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
|
2205 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
|
2206 hr->par_clear(); |
|
17773
8ee855b4e667
8036025: Sort the freelist in order to shrink the heap
jwilhelm
parents:
17750
diff
changeset
|
2207 tmp_free_list.add_ordered(hr); |
| 2152 | 2208 |
| 2209 // Instead of adding one region at a time to the secondary_free_list, | |
| 2210 // we accumulate them in the local list and move them a few at a | |
| 2211 // time. This also cuts down on the number of notify_all() calls | |
| 2212 // we do during this process. We'll also append the local list when | |
| 2213 // _cleanup_list is empty (which means we just removed the last | |
| 2214 // region from the _cleanup_list). | |
| 2361 | 2215 if ((tmp_free_list.length() % G1SecondaryFreeListAppendLength == 0) || |
| 2152 | 2216 _cleanup_list.is_empty()) { |
| 2217 if (G1ConcRegionFreeingVerbose) { | |
| 2218 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
|
2219 "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
|
2220 "cleanup list still has %u entries", |
| 2361 | 2221 tmp_free_list.length(), |
| 2152 | 2222 _cleanup_list.length()); |
| 342 | 2223 } |
| 2152 | 2224 |
| 2225 { | |
| 2226 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
|
17773
8ee855b4e667
8036025: Sort the freelist in order to shrink the heap
jwilhelm
parents:
17750
diff
changeset
|
2227 g1h->secondary_free_list_add(&tmp_free_list); |
| 2152 | 2228 SecondaryFreeList_lock->notify_all(); |
| 2229 } | |
| 2230 | |
| 2231 if (G1StressConcRegionFreeing) { | |
| 2232 for (uintx i = 0; i < G1StressConcRegionFreeingDelayMillis; ++i) { | |
| 2233 os::sleep(Thread::current(), (jlong) 1, false); | |
| 2234 } | |
| 2235 } | |
| 342 | 2236 } |
| 2237 } | |
| 2361 | 2238 assert(tmp_free_list.is_empty(), "post-condition"); |
| 342 | 2239 } |
| 2240 | |
|
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2241 // Supporting Object and Oop closures for reference discovery |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2242 // and processing in during marking |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2243 |
|
2037
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2244 bool G1CMIsAliveClosure::do_object_b(oop obj) { |
|
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2245 HeapWord* addr = (HeapWord*)obj; |
|
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2246 return addr != NULL && |
|
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2247 (!_g1->is_in_g1_reserved(addr) || !_g1->is_obj_ill(obj)); |
|
b03260081e9b
7006113: G1: Initialize ReferenceProcessor::_is_alive_non_header field
johnc
parents:
1974
diff
changeset
|
2248 } |
| 342 | 2249 |
|
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2250 // 'Keep Alive' oop closure used by both serial parallel reference processing. |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2251 // Uses the CMTask associated with a worker thread (for serial reference |
|
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2252 // processing the CMTask for worker 0 is used) to preserve (mark) and |
|
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2253 // trace referent objects. |
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|
2254 // |
|
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2255 // Using the CMTask and embedded local queues avoids having the worker |
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|
2256 // threads operating on the global mark stack. This reduces the risk |
|
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|
2257 // of overflowing the stack - which we would rather avoid at this late |
|
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2258 // state. Also using the tasks' local queues removes the potential |
|
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2259 // of the workers interfering with each other that could occur if |
|
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|
2260 // operating on the global stack. |
|
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2261 |
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|
2262 class G1CMKeepAliveAndDrainClosure: public OopClosure { |
|
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2263 ConcurrentMark* _cm; |
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|
2264 CMTask* _task; |
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2265 int _ref_counter_limit; |
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|
2266 int _ref_counter; |
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2267 bool _is_serial; |
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2268 public: |
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2269 G1CMKeepAliveAndDrainClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
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2270 _cm(cm), _task(task), _is_serial(is_serial), |
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2271 _ref_counter_limit(G1RefProcDrainInterval) { |
|
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2272 assert(_ref_counter_limit > 0, "sanity"); |
|
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2273 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
|
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2274 _ref_counter = _ref_counter_limit; |
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|
2275 } |
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2276 |
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2277 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
|
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2278 virtual void do_oop( oop* p) { do_oop_work(p); } |
|
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2279 |
|
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|
2280 template <class T> void do_oop_work(T* p) { |
|
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|
2281 if (!_cm->has_overflown()) { |
|
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|
2282 oop obj = oopDesc::load_decode_heap_oop(p); |
|
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|
2283 if (_cm->verbose_high()) { |
|
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|
2284 gclog_or_tty->print_cr("\t[%u] we're looking at location " |
|
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|
2285 "*"PTR_FORMAT" = "PTR_FORMAT, |
|
17937
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|
2286 _task->worker_id(), p2i(p), p2i((void*) obj)); |
|
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|
2287 } |
|
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|
2288 |
|
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|
2289 _task->deal_with_reference(obj); |
|
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|
2290 _ref_counter--; |
|
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|
2291 |
|
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|
2292 if (_ref_counter == 0) { |
|
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|
2293 // We have dealt with _ref_counter_limit references, pushing them |
|
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|
2294 // and objects reachable from them on to the local stack (and |
|
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|
2295 // possibly the global stack). Call CMTask::do_marking_step() to |
|
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|
2296 // process these entries. |
|
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|
2297 // |
|
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|
2298 // We call CMTask::do_marking_step() in a loop, which we'll exit if |
|
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|
2299 // there's nothing more to do (i.e. we're done with the entries that |
|
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|
2300 // were pushed as a result of the CMTask::deal_with_reference() calls |
|
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|
2301 // above) or we overflow. |
|
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|
2302 // |
|
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|
2303 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
|
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|
2304 // flag while there may still be some work to do. (See the comment at |
|
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|
2305 // the beginning of CMTask::do_marking_step() for those conditions - |
|
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changeset
|
2306 // one of which is reaching the specified time target.) It is only |
|
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|
2307 // when CMTask::do_marking_step() returns without setting the |
|
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|
2308 // has_aborted() flag that the marking step has completed. |
|
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|
2309 do { |
|
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|
2310 double mark_step_duration_ms = G1ConcMarkStepDurationMillis; |
|
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|
2311 _task->do_marking_step(mark_step_duration_ms, |
|
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|
2312 false /* do_termination */, |
|
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|
2313 _is_serial); |
|
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|
2314 } while (_task->has_aborted() && !_cm->has_overflown()); |
|
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|
2315 _ref_counter = _ref_counter_limit; |
|
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|
2316 } |
|
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|
2317 } else { |
|
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changeset
|
2318 if (_cm->verbose_high()) { |
|
6862
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changeset
|
2319 gclog_or_tty->print_cr("\t[%u] CM Overflow", _task->worker_id()); |
|
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|
2320 } |
|
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|
2321 } |
|
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|
2322 } |
|
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|
2323 }; |
|
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|
2324 |
|
8014
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changeset
|
2325 // 'Drain' oop closure used by both serial and parallel reference processing. |
|
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changeset
|
2326 // Uses the CMTask associated with a given worker thread (for serial |
|
f90b9bceb8e5
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changeset
|
2327 // reference processing the CMtask for worker 0 is used). Calls the |
|
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changeset
|
2328 // do_marking_step routine, with an unbelievably large timeout value, |
|
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changeset
|
2329 // to drain the marking data structures of the remaining entries |
|
f90b9bceb8e5
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changeset
|
2330 // added by the 'keep alive' oop closure above. |
|
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8008
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|
2331 |
|
f90b9bceb8e5
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|
2332 class G1CMDrainMarkingStackClosure: public VoidClosure { |
|
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|
2333 ConcurrentMark* _cm; |
|
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|
2334 CMTask* _task; |
|
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|
2335 bool _is_serial; |
|
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|
2336 public: |
|
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|
2337 G1CMDrainMarkingStackClosure(ConcurrentMark* cm, CMTask* task, bool is_serial) : |
|
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|
2338 _cm(cm), _task(task), _is_serial(is_serial) { |
|
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|
2339 assert(!_is_serial || _task->worker_id() == 0, "only task 0 for serial code"); |
|
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|
2340 } |
|
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|
2341 |
|
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|
2342 void do_void() { |
|
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|
2343 do { |
|
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|
2344 if (_cm->verbose_high()) { |
|
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|
2345 gclog_or_tty->print_cr("\t[%u] Drain: Calling do_marking_step - serial: %s", |
|
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|
2346 _task->worker_id(), BOOL_TO_STR(_is_serial)); |
|
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|
2347 } |
|
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|
2348 |
|
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changeset
|
2349 // We call CMTask::do_marking_step() to completely drain the local |
|
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|
2350 // and global marking stacks of entries pushed by the 'keep alive' |
|
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|
2351 // oop closure (an instance of G1CMKeepAliveAndDrainClosure above). |
|
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|
2352 // |
|
f90b9bceb8e5
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|
2353 // CMTask::do_marking_step() is called in a loop, which we'll exit |
|
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changeset
|
2354 // if there's nothing more to do (i.e. we'completely drained the |
|
f90b9bceb8e5
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changeset
|
2355 // entries that were pushed as a a result of applying the 'keep alive' |
|
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changeset
|
2356 // closure to the entries on the discovered ref lists) or we overflow |
|
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|
2357 // the global marking stack. |
|
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changeset
|
2358 // |
|
f90b9bceb8e5
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|
2359 // Note: CMTask::do_marking_step() can set the CMTask::has_aborted() |
|
f90b9bceb8e5
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changeset
|
2360 // flag while there may still be some work to do. (See the comment at |
|
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changeset
|
2361 // the beginning of CMTask::do_marking_step() for those conditions - |
|
f90b9bceb8e5
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changeset
|
2362 // one of which is reaching the specified time target.) It is only |
|
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changeset
|
2363 // when CMTask::do_marking_step() returns without setting the |
|
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|
2364 // has_aborted() flag that the marking step has completed. |
|
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|
2365 |
|
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|
2366 _task->do_marking_step(1000000000.0 /* something very large */, |
|
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|
2367 true /* do_termination */, |
|
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|
2368 _is_serial); |
|
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|
2369 } while (_task->has_aborted() && !_cm->has_overflown()); |
|
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|
2370 } |
|
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|
2371 }; |
|
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|
2372 |
|
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|
2373 // Implementation of AbstractRefProcTaskExecutor for parallel |
|
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|
2374 // reference processing at the end of G1 concurrent marking |
|
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|
2375 |
|
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|
2376 class G1CMRefProcTaskExecutor: public AbstractRefProcTaskExecutor { |
|
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|
2377 private: |
|
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|
2378 G1CollectedHeap* _g1h; |
|
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|
2379 ConcurrentMark* _cm; |
|
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|
2380 WorkGang* _workers; |
|
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|
2381 int _active_workers; |
|
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|
2382 |
|
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|
2383 public: |
|
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|
2384 G1CMRefProcTaskExecutor(G1CollectedHeap* g1h, |
|
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|
2385 ConcurrentMark* cm, |
|
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|
2386 WorkGang* workers, |
|
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|
2387 int n_workers) : |
|
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|
2388 _g1h(g1h), _cm(cm), |
|
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|
2389 _workers(workers), _active_workers(n_workers) { } |
|
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2390 |
|
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|
2391 // Executes the given task using concurrent marking worker threads. |
|
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|
2392 virtual void execute(ProcessTask& task); |
|
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|
2393 virtual void execute(EnqueueTask& task); |
|
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|
2394 }; |
|
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|
2395 |
|
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2396 class G1CMRefProcTaskProxy: public AbstractGangTask { |
|
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2397 typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask; |
|
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|
2398 ProcessTask& _proc_task; |
|
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|
2399 G1CollectedHeap* _g1h; |
|
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|
2400 ConcurrentMark* _cm; |
|
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|
2401 |
|
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|
2402 public: |
|
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|
2403 G1CMRefProcTaskProxy(ProcessTask& proc_task, |
|
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|
2404 G1CollectedHeap* g1h, |
|
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|
2405 ConcurrentMark* cm) : |
|
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|
2406 AbstractGangTask("Process reference objects in parallel"), |
|
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|
2407 _proc_task(proc_task), _g1h(g1h), _cm(cm) { |
|
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|
2408 ReferenceProcessor* rp = _g1h->ref_processor_cm(); |
|
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|
2409 assert(rp->processing_is_mt(), "shouldn't be here otherwise"); |
|
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|
2410 } |
|
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|
2411 |
|
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|
2412 virtual void work(uint worker_id) { |
|
20306
e02e18f40eae
8050973: CMS/G1 GC: add missing Resource and Handle mark
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|
2413 ResourceMark rm; |
|
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|
2414 HandleMark hm; |
|
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|
2415 CMTask* task = _cm->task(worker_id); |
|
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|
2416 G1CMIsAliveClosure g1_is_alive(_g1h); |
|
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|
2417 G1CMKeepAliveAndDrainClosure g1_par_keep_alive(_cm, task, false /* is_serial */); |
|
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|
2418 G1CMDrainMarkingStackClosure g1_par_drain(_cm, task, false /* is_serial */); |
|
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|
2419 |
|
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|
2420 _proc_task.work(worker_id, g1_is_alive, g1_par_keep_alive, g1_par_drain); |
|
2174
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|
2421 } |
|
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|
2422 }; |
|
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|
2423 |
|
3979
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|
2424 void G1CMRefProcTaskExecutor::execute(ProcessTask& proc_task) { |
|
2174
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|
2425 assert(_workers != NULL, "Need parallel worker threads."); |
|
8014
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|
2426 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
|
2174
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|
2427 |
|
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|
2428 G1CMRefProcTaskProxy proc_task_proxy(proc_task, _g1h, _cm); |
|
2174
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|
2429 |
|
8788
e864cc14ca75
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|
2430 // We need to reset the concurrency level before each |
|
e864cc14ca75
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|
2431 // proxy task execution, so that the termination protocol |
|
e864cc14ca75
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8787
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|
2432 // and overflow handling in CMTask::do_marking_step() knows |
|
e864cc14ca75
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|
2433 // how many workers to wait for. |
|
e864cc14ca75
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|
2434 _cm->set_concurrency(_active_workers); |
|
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|
2435 _g1h->set_par_threads(_active_workers); |
|
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|
2436 _workers->run_task(&proc_task_proxy); |
|
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|
2437 _g1h->set_par_threads(0); |
|
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|
2438 } |
|
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|
2439 |
|
3979
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|
2440 class G1CMRefEnqueueTaskProxy: public AbstractGangTask { |
|
2174
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|
2441 typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask; |
|
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|
2442 EnqueueTask& _enq_task; |
|
234761c55641
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diff
changeset
|
2443 |
|
234761c55641
6608385: G1: need to support parallel reference processing
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|
2444 public: |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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diff
changeset
|
2445 G1CMRefEnqueueTaskProxy(EnqueueTask& enq_task) : |
|
2174
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|
2446 AbstractGangTask("Enqueue reference objects in parallel"), |
|
4093
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|
2447 _enq_task(enq_task) { } |
|
2174
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|
2448 |
|
4728
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7121618: Change type of number of GC workers to unsigned int.
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diff
changeset
|
2449 virtual void work(uint worker_id) { |
|
441e946dc1af
7121618: Change type of number of GC workers to unsigned int.
jmasa
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|
2450 _enq_task.work(worker_id); |
|
2174
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|
2451 } |
|
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diff
changeset
|
2452 }; |
|
234761c55641
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changeset
|
2453 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
2454 void G1CMRefProcTaskExecutor::execute(EnqueueTask& enq_task) { |
|
2174
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|
2455 assert(_workers != NULL, "Need parallel worker threads."); |
|
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
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diff
changeset
|
2456 assert(_g1h->ref_processor_cm()->processing_is_mt(), "processing is not MT"); |
|
2174
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|
2457 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
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|
2458 G1CMRefEnqueueTaskProxy enq_task_proxy(enq_task); |
|
2174
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|
2459 |
|
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2460 // Not strictly necessary but... |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
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8787
diff
changeset
|
2461 // |
|
e864cc14ca75
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johnc
parents:
8787
diff
changeset
|
2462 // We need to reset the concurrency level before each |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2463 // proxy task execution, so that the termination protocol |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2464 // and overflow handling in CMTask::do_marking_step() knows |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2465 // how many workers to wait for. |
|
e864cc14ca75
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8787
diff
changeset
|
2466 _cm->set_concurrency(_active_workers); |
|
2174
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|
2467 _g1h->set_par_threads(_active_workers); |
|
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|
2468 _workers->run_task(&enq_task_proxy); |
|
234761c55641
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diff
changeset
|
2469 _g1h->set_par_threads(0); |
|
234761c55641
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diff
changeset
|
2470 } |
|
234761c55641
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2152
diff
changeset
|
2471 |
|
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2472 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
|
2473 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
|
2474 } |
|
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
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20263
diff
changeset
|
2476 // 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
|
2477 class G1RemarkGCTraceTime : public GCTraceTime { |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
changeset
|
2478 static bool doit_and_prepend(bool doit) { |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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20263
diff
changeset
|
2479 if (doit) { |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2480 gclog_or_tty->put(' '); |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2481 } |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2482 return doit; |
|
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:
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diff
changeset
|
2484 |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2485 public: |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
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diff
changeset
|
2486 G1RemarkGCTraceTime(const char* title, bool doit) |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2487 : GCTraceTime(title, doit_and_prepend(doit), false, G1CollectedHeap::heap()->gc_timer_cm(), |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
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diff
changeset
|
2488 G1CollectedHeap::heap()->concurrent_mark()->concurrent_gc_id()) { |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2489 } |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
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diff
changeset
|
2490 }; |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
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diff
changeset
|
2491 |
| 342 | 2492 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
|
2493 if (has_overflown()) { |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2494 // Skip processing the discovered references if we have |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2495 // overflown the global marking stack. Reference objects |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2496 // 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
|
2497 // 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
|
2498 // 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
|
2499 // less reference objects are discovered. |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2500 return; |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2501 } |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2502 |
| 342 | 2503 ResourceMark rm; |
| 2504 HandleMark hm; | |
|
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2505 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2506 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2507 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2508 // Is alive closure. |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2509 G1CMIsAliveClosure g1_is_alive(g1h); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2510 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2511 // 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
|
2512 // tables from the displayed time. |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2513 { |
|
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
5988
diff
changeset
|
2514 if (G1Log::finer()) { |
|
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2515 gclog_or_tty->put(' '); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2516 } |
|
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
2517 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
|
2518 |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2519 ReferenceProcessor* rp = g1h->ref_processor_cm(); |
|
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2520 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2521 // See the comment in G1CollectedHeap::ref_processing_init() |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2522 // about how reference processing currently works in G1. |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2523 |
|
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2524 // Set the soft reference policy |
|
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2525 rp->setup_policy(clear_all_soft_refs); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2526 assert(_markStack.isEmpty(), "mark stack should be empty"); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2527 |
|
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2528 // Instances of the 'Keep Alive' and 'Complete GC' closures used |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2529 // in serial reference processing. Note these closures are also |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2530 // used for serially processing (by the the current thread) the |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2531 // JNI references during parallel reference processing. |
|
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 // These closures do not need to synchronize with the worker |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2534 // threads involved in parallel reference processing as these |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2535 // instances are executed serially by the current thread (e.g. |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2536 // reference processing is not multi-threaded and is thus |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2537 // performed by the current thread instead of a gang worker). |
|
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 // The gang tasks involved in parallel reference procssing create |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2540 // their own instances of these closures, which do their own |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2541 // synchronization among themselves. |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2542 G1CMKeepAliveAndDrainClosure g1_keep_alive(this, task(0), true /* is_serial */); |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2543 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
|
2544 |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2545 // We need at least one active thread. If reference processing |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2546 // is not multi-threaded we use the current (VMThread) thread, |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2547 // otherwise we use the work gang from the G1CollectedHeap and |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2548 // we utilize all the worker threads we can. |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2549 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
|
2550 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
|
2551 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
|
2552 |
|
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2553 // Parallel processing task executor. |
|
4093
6071e0581859
7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
4072
diff
changeset
|
2554 G1CMRefProcTaskExecutor par_task_executor(g1h, this, |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2555 g1h->workers(), active_workers); |
|
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2556 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
|
2557 |
|
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2558 // 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
|
2559 // executing the remark task. |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2560 set_concurrency(active_workers); |
|
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
2561 |
|
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2562 // 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
|
2563 // 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
|
2564 // 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
|
2565 // 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
|
2566 rp->set_active_mt_degree(active_workers); |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2567 |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2568 // Process the weak references. |
| 10405 | 2569 const ReferenceProcessorStats& stats = |
| 2570 rp->process_discovered_references(&g1_is_alive, | |
| 2571 &g1_keep_alive, | |
| 2572 &g1_drain_mark_stack, | |
| 2573 executor, | |
|
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
2574 g1h->gc_timer_cm(), |
|
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
2575 concurrent_gc_id()); |
| 10405 | 2576 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
|
2577 |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2578 // 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
|
2579 // 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
|
2580 // global marking stack. |
|
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2581 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2582 assert(_markStack.overflow() || _markStack.isEmpty(), |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2583 "mark stack should be empty (unless it overflowed)"); |
|
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
2584 |
|
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2585 if (_markStack.overflow()) { |
|
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2586 // 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
|
2587 // 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
|
2588 set_has_overflown(); |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2589 } |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2590 |
|
8014
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2591 assert(rp->num_q() == active_workers, "why not"); |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2592 |
|
f90b9bceb8e5
8005032: G1: Cleanup serial reference processing closures in concurrent marking
johnc
parents:
8008
diff
changeset
|
2593 rp->enqueue_discovered_references(executor); |
|
3975
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2594 |
|
1847b501ae74
7068215: G1: Print reference processing time during remark
johnc
parents:
3914
diff
changeset
|
2595 rp->verify_no_references_recorded(); |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3977
diff
changeset
|
2596 assert(!rp->discovery_enabled(), "Post condition"); |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2597 } |
|
234761c55641
6608385: G1: need to support parallel reference processing
johnc
parents:
2152
diff
changeset
|
2598 |
|
17750
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2599 if (has_overflown()) { |
|
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2600 // 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
|
2601 return; |
|
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2602 } |
|
f53edbc2b728
8036673: G1: Abort weak reference processing if mark stack overflows
pliden
parents:
17736
diff
changeset
|
2603 |
|
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2604 assert(_markStack.isEmpty(), "Marking should have completed"); |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2605 |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2606 // Unload Klasses, String, Symbols, Code Cache, etc. |
|
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
20263
diff
changeset
|
2607 { |
|
20282
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2608 G1RemarkGCTraceTime trace("Unloading", G1Log::finer()); |
|
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2609 |
|
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2610 if (ClassUnloadingWithConcurrentMark) { |
|
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2611 bool purged_classes; |
|
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2612 |
|
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2613 { |
|
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2614 G1RemarkGCTraceTime trace("System Dictionary Unloading", G1Log::finest()); |
|
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2615 purged_classes = SystemDictionary::do_unloading(&g1_is_alive); |
|
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2616 } |
|
f3aeae1f9fc5
8048269: Add flag to turn off class unloading after G1 concurrent mark
stefank
parents:
20278
diff
changeset
|
2617 |
|
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2618 { |
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2619 G1RemarkGCTraceTime trace("Parallel Unloading", G1Log::finest()); |
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2620 weakRefsWorkParallelPart(&g1_is_alive, purged_classes); |
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2621 } |
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2622 } |
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2623 |
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2624 if (G1StringDedup::is_enabled()) { |
|
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2625 G1RemarkGCTraceTime trace("String Deduplication Unlink", G1Log::finest()); |
|
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2626 G1StringDedup::unlink(&g1_is_alive); |
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2627 } |
|
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2628 } |
| 342 | 2629 } |
| 2630 | |
| 2631 void ConcurrentMark::swapMarkBitMaps() { | |
| 2632 CMBitMapRO* temp = _prevMarkBitMap; | |
| 2633 _prevMarkBitMap = (CMBitMapRO*)_nextMarkBitMap; | |
| 2634 _nextMarkBitMap = (CMBitMap*) temp; | |
| 2635 } | |
| 2636 | |
|
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2637 class CMObjectClosure; |
|
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2638 |
|
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2639 // Closure for iterating over objects, currently only used for |
|
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2640 // processing SATB buffers. |
|
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2641 class CMObjectClosure : public ObjectClosure { |
|
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2642 private: |
|
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2643 CMTask* _task; |
|
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2644 |
|
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2645 public: |
|
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2646 void do_object(oop obj) { |
|
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2647 _task->deal_with_reference(obj); |
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2648 } |
|
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2649 |
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2650 CMObjectClosure(CMTask* task) : _task(task) { } |
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2651 }; |
|
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2652 |
|
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2653 class G1RemarkThreadsClosure : public ThreadClosure { |
|
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2654 CMObjectClosure _cm_obj; |
|
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2655 G1CMOopClosure _cm_cl; |
|
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2656 MarkingCodeBlobClosure _code_cl; |
|
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2657 int _thread_parity; |
|
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|
2658 bool _is_par; |
|
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2659 |
|
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2660 public: |
|
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|
2661 G1RemarkThreadsClosure(G1CollectedHeap* g1h, CMTask* task, bool is_par) : |
|
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2662 _cm_obj(task), _cm_cl(g1h, g1h->concurrent_mark(), task), _code_cl(&_cm_cl, !CodeBlobToOopClosure::FixRelocations), |
|
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2663 _thread_parity(SharedHeap::heap()->strong_roots_parity()), _is_par(is_par) {} |
|
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2664 |
|
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|
2665 void do_thread(Thread* thread) { |
|
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2666 if (thread->is_Java_thread()) { |
|
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2667 if (thread->claim_oops_do(_is_par, _thread_parity)) { |
|
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|
2668 JavaThread* jt = (JavaThread*)thread; |
|
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2669 |
|
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|
2670 // In theory it should not be neccessary to explicitly walk the nmethods to find roots for concurrent marking |
|
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|
2671 // however the liveness of oops reachable from nmethods have very complex lifecycles: |
|
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|
2672 // * Alive if on the stack of an executing method |
|
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|
2673 // * Weakly reachable otherwise |
|
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|
2674 // Some objects reachable from nmethods, such as the class loader (or klass_holder) of the receiver should be |
|
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2675 // live by the SATB invariant but other oops recorded in nmethods may behave differently. |
|
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|
2676 jt->nmethods_do(&_code_cl); |
|
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2677 |
|
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|
2678 jt->satb_mark_queue().apply_closure_and_empty(&_cm_obj); |
|
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|
2679 } |
|
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|
2680 } else if (thread->is_VM_thread()) { |
|
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|
2681 if (thread->claim_oops_do(_is_par, _thread_parity)) { |
|
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|
2682 JavaThread::satb_mark_queue_set().shared_satb_queue()->apply_closure_and_empty(&_cm_obj); |
|
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|
2683 } |
|
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|
2684 } |
|
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|
2685 } |
|
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|
2686 }; |
|
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|
2687 |
| 342 | 2688 class CMRemarkTask: public AbstractGangTask { |
| 2689 private: | |
|
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|
2690 ConcurrentMark* _cm; |
|
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|
2691 bool _is_serial; |
| 342 | 2692 public: |
|
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|
2693 void work(uint worker_id) { |
| 342 | 2694 // Since all available tasks are actually started, we should |
| 2695 // only proceed if we're supposed to be actived. | |
|
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|
2696 if (worker_id < _cm->active_tasks()) { |
|
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|
2697 CMTask* task = _cm->task(worker_id); |
| 342 | 2698 task->record_start_time(); |
|
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2699 { |
|
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|
2700 ResourceMark rm; |
|
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|
2701 HandleMark hm; |
|
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|
2702 |
|
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|
2703 G1RemarkThreadsClosure threads_f(G1CollectedHeap::heap(), task, !_is_serial); |
|
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|
2704 Threads::threads_do(&threads_f); |
|
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2705 } |
|
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|
2706 |
| 342 | 2707 do { |
|
2174
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|
2708 task->do_marking_step(1000000000.0 /* something very large */, |
|
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|
2709 true /* do_termination */, |
|
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|
2710 _is_serial); |
| 342 | 2711 } while (task->has_aborted() && !_cm->has_overflown()); |
| 2712 // If we overflow, then we do not want to restart. We instead | |
| 2713 // want to abort remark and do concurrent marking again. | |
| 2714 task->record_end_time(); | |
| 2715 } | |
| 2716 } | |
| 2717 | |
|
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|
2718 CMRemarkTask(ConcurrentMark* cm, int active_workers, bool is_serial) : |
|
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|
2719 AbstractGangTask("Par Remark"), _cm(cm), _is_serial(is_serial) { |
| 4711 | 2720 _cm->terminator()->reset_for_reuse(active_workers); |
|
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|
2721 } |
| 342 | 2722 }; |
| 2723 | |
| 2724 void ConcurrentMark::checkpointRootsFinalWork() { | |
| 2725 ResourceMark rm; | |
| 2726 HandleMark hm; | |
| 2727 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 2728 | |
|
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|
2729 G1RemarkGCTraceTime trace("Finalize Marking", G1Log::finer()); |
|
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2730 |
| 342 | 2731 g1h->ensure_parsability(false); |
| 2732 | |
|
1833
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|
2733 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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|
2734 G1CollectedHeap::StrongRootsScope srs(g1h); |
|
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|
2735 // this is remark, so we'll use up all active threads |
|
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|
2736 uint active_workers = g1h->workers()->active_workers(); |
|
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|
2737 if (active_workers == 0) { |
|
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|
2738 assert(active_workers > 0, "Should have been set earlier"); |
|
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|
2739 active_workers = (uint) ParallelGCThreads; |
|
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|
2740 g1h->workers()->set_active_workers(active_workers); |
|
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|
2741 } |
|
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|
2742 set_concurrency_and_phase(active_workers, false /* concurrent */); |
|
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|
2743 // Leave _parallel_marking_threads at it's |
|
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|
2744 // value originally calculated in the ConcurrentMark |
|
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|
2745 // constructor and pass values of the active workers |
|
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|
2746 // through the gang in the task. |
| 342 | 2747 |
|
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|
2748 CMRemarkTask remarkTask(this, active_workers, false /* is_serial */); |
|
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|
2749 // We will start all available threads, even if we decide that the |
|
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|
2750 // active_workers will be fewer. The extra ones will just bail out |
|
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|
2751 // immediately. |
|
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|
2752 g1h->set_par_threads(active_workers); |
| 342 | 2753 g1h->workers()->run_task(&remarkTask); |
| 2754 g1h->set_par_threads(0); | |
| 2755 } else { | |
|
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|
2756 G1CollectedHeap::StrongRootsScope srs(g1h); |
|
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|
2757 uint active_workers = 1; |
|
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|
2758 set_concurrency_and_phase(active_workers, false /* concurrent */); |
| 342 | 2759 |
|
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|
2760 // Note - if there's no work gang then the VMThread will be |
|
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|
2761 // the thread to execute the remark - serially. We have |
|
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|
2762 // to pass true for the is_serial parameter so that |
|
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|
2763 // CMTask::do_marking_step() doesn't enter the sync |
|
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|
2764 // barriers in the event of an overflow. Doing so will |
|
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|
2765 // cause an assert that the current thread is not a |
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|
2766 // concurrent GC thread. |
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|
2767 CMRemarkTask remarkTask(this, active_workers, true /* is_serial*/); |
| 342 | 2768 remarkTask.work(0); |
| 2769 } | |
|
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2770 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); |
|
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2771 guarantee(has_overflown() || |
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2772 satb_mq_set.completed_buffers_num() == 0, |
|
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2773 err_msg("Invariant: has_overflown = %s, num buffers = %d", |
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2774 BOOL_TO_STR(has_overflown()), |
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2775 satb_mq_set.completed_buffers_num())); |
| 342 | 2776 |
| 2777 print_stats(); | |
| 2778 } | |
| 2779 | |
| 1044 | 2780 #ifndef PRODUCT |
| 2781 | |
| 1388 | 2782 class PrintReachableOopClosure: public OopClosure { |
| 342 | 2783 private: |
| 2784 G1CollectedHeap* _g1h; | |
| 2785 outputStream* _out; | |
|
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2786 VerifyOption _vo; |
| 1388 | 2787 bool _all; |
| 342 | 2788 |
| 2789 public: | |
|
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2790 PrintReachableOopClosure(outputStream* out, |
|
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2791 VerifyOption vo, |
| 1388 | 2792 bool all) : |
| 1044 | 2793 _g1h(G1CollectedHeap::heap()), |
|
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2794 _out(out), _vo(vo), _all(all) { } |
| 342 | 2795 |
|
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|
2796 void do_oop(narrowOop* p) { do_oop_work(p); } |
|
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2797 void do_oop( oop* p) { do_oop_work(p); } |
|
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2798 |
|
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2799 template <class T> void do_oop_work(T* p) { |
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2800 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 2801 const char* str = NULL; |
| 2802 const char* str2 = ""; | |
| 2803 | |
| 1388 | 2804 if (obj == NULL) { |
| 2805 str = ""; | |
| 2806 } else if (!_g1h->is_in_g1_reserved(obj)) { | |
| 2807 str = " O"; | |
| 2808 } else { | |
| 342 | 2809 HeapRegion* hr = _g1h->heap_region_containing(obj); |
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2810 bool over_tams = _g1h->allocated_since_marking(obj, hr, _vo); |
|
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2811 bool marked = _g1h->is_marked(obj, _vo); |
| 1044 | 2812 |
| 2813 if (over_tams) { | |
| 1388 | 2814 str = " >"; |
| 2815 if (marked) { | |
| 342 | 2816 str2 = " AND MARKED"; |
| 1044 | 2817 } |
| 1388 | 2818 } else if (marked) { |
| 2819 str = " M"; | |
| 1044 | 2820 } else { |
| 1388 | 2821 str = " NOT"; |
| 1044 | 2822 } |
| 342 | 2823 } |
| 2824 | |
| 1388 | 2825 _out->print_cr(" "PTR_FORMAT": "PTR_FORMAT"%s%s", |
|
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|
2826 p2i(p), p2i((void*) obj), str, str2); |
| 342 | 2827 } |
| 2828 }; | |
| 2829 | |
| 1388 | 2830 class PrintReachableObjectClosure : public ObjectClosure { |
| 342 | 2831 private: |
|
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|
2832 G1CollectedHeap* _g1h; |
|
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|
2833 outputStream* _out; |
|
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|
2834 VerifyOption _vo; |
|
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|
2835 bool _all; |
|
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|
2836 HeapRegion* _hr; |
| 342 | 2837 |
| 2838 public: | |
|
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|
2839 PrintReachableObjectClosure(outputStream* out, |
|
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|
2840 VerifyOption vo, |
| 1388 | 2841 bool all, |
| 2842 HeapRegion* hr) : | |
|
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|
2843 _g1h(G1CollectedHeap::heap()), |
|
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|
2844 _out(out), _vo(vo), _all(all), _hr(hr) { } |
| 1388 | 2845 |
| 2846 void do_object(oop o) { | |
|
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|
2847 bool over_tams = _g1h->allocated_since_marking(o, _hr, _vo); |
|
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|
2848 bool marked = _g1h->is_marked(o, _vo); |
| 1388 | 2849 bool print_it = _all || over_tams || marked; |
| 2850 | |
| 2851 if (print_it) { | |
| 2852 _out->print_cr(" "PTR_FORMAT"%s", | |
|
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|
2853 p2i((void *)o), (over_tams) ? " >" : (marked) ? " M" : ""); |
|
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|
2854 PrintReachableOopClosure oopCl(_out, _vo, _all); |
|
6725
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|
2855 o->oop_iterate_no_header(&oopCl); |
| 1388 | 2856 } |
| 342 | 2857 } |
| 2858 }; | |
| 2859 | |
| 1388 | 2860 class PrintReachableRegionClosure : public HeapRegionClosure { |
| 342 | 2861 private: |
|
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|
2862 G1CollectedHeap* _g1h; |
|
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|
2863 outputStream* _out; |
|
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|
2864 VerifyOption _vo; |
|
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|
2865 bool _all; |
| 342 | 2866 |
| 2867 public: | |
| 2868 bool doHeapRegion(HeapRegion* hr) { | |
| 2869 HeapWord* b = hr->bottom(); | |
| 2870 HeapWord* e = hr->end(); | |
| 2871 HeapWord* t = hr->top(); | |
|
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|
2872 HeapWord* p = _g1h->top_at_mark_start(hr, _vo); |
| 342 | 2873 _out->print_cr("** ["PTR_FORMAT", "PTR_FORMAT"] top: "PTR_FORMAT" " |
|
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|
2874 "TAMS: " PTR_FORMAT, p2i(b), p2i(e), p2i(t), p2i(p)); |
| 1388 | 2875 _out->cr(); |
| 2876 | |
| 2877 HeapWord* from = b; | |
| 2878 HeapWord* to = t; | |
| 2879 | |
| 2880 if (to > from) { | |
|
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|
2881 _out->print_cr("Objects in [" PTR_FORMAT ", " PTR_FORMAT "]", p2i(from), p2i(to)); |
| 1388 | 2882 _out->cr(); |
|
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|
2883 PrintReachableObjectClosure ocl(_out, _vo, _all, hr); |
| 1388 | 2884 hr->object_iterate_mem_careful(MemRegion(from, to), &ocl); |
| 2885 _out->cr(); | |
| 2886 } | |
| 342 | 2887 |
| 2888 return false; | |
| 2889 } | |
| 2890 | |
|
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|
2891 PrintReachableRegionClosure(outputStream* out, |
|
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|
2892 VerifyOption vo, |
| 1388 | 2893 bool all) : |
|
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|
2894 _g1h(G1CollectedHeap::heap()), _out(out), _vo(vo), _all(all) { } |
| 342 | 2895 }; |
| 2896 | |
| 1388 | 2897 void ConcurrentMark::print_reachable(const char* str, |
|
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|
2898 VerifyOption vo, |
| 1388 | 2899 bool all) { |
| 2900 gclog_or_tty->cr(); | |
| 2901 gclog_or_tty->print_cr("== Doing heap dump... "); | |
| 1044 | 2902 |
| 2903 if (G1PrintReachableBaseFile == NULL) { | |
| 2904 gclog_or_tty->print_cr(" #### error: no base file defined"); | |
| 2905 return; | |
| 2906 } | |
| 2907 | |
| 2908 if (strlen(G1PrintReachableBaseFile) + 1 + strlen(str) > | |
| 2909 (JVM_MAXPATHLEN - 1)) { | |
| 2910 gclog_or_tty->print_cr(" #### error: file name too long"); | |
| 2911 return; | |
| 2912 } | |
| 2913 | |
| 2914 char file_name[JVM_MAXPATHLEN]; | |
| 2915 sprintf(file_name, "%s.%s", G1PrintReachableBaseFile, str); | |
| 2916 gclog_or_tty->print_cr(" dumping to file %s", file_name); | |
| 2917 | |
| 2918 fileStream fout(file_name); | |
| 2919 if (!fout.is_open()) { | |
| 2920 gclog_or_tty->print_cr(" #### error: could not open file"); | |
| 2921 return; | |
| 2922 } | |
| 2923 | |
| 2924 outputStream* out = &fout; | |
|
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|
2925 out->print_cr("-- USING %s", _g1h->top_at_mark_start_str(vo)); |
| 1044 | 2926 out->cr(); |
| 2927 | |
| 1388 | 2928 out->print_cr("--- ITERATING OVER REGIONS"); |
| 1044 | 2929 out->cr(); |
|
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|
2930 PrintReachableRegionClosure rcl(out, vo, all); |
| 1388 | 2931 _g1h->heap_region_iterate(&rcl); |
| 1044 | 2932 out->cr(); |
| 2933 | |
| 2934 gclog_or_tty->print_cr(" done"); | |
| 1388 | 2935 gclog_or_tty->flush(); |
| 342 | 2936 } |
| 2937 | |
| 1044 | 2938 #endif // PRODUCT |
| 2939 | |
|
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|
2940 void ConcurrentMark::clearRangePrevBitmap(MemRegion mr) { |
| 342 | 2941 // Note we are overriding the read-only view of the prev map here, via |
| 2942 // the cast. | |
| 2943 ((CMBitMap*)_prevMarkBitMap)->clearRange(mr); | |
|
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|
2944 } |
|
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|
2945 |
|
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|
2946 void ConcurrentMark::clearRangeNextBitmap(MemRegion mr) { |
| 342 | 2947 _nextMarkBitMap->clearRange(mr); |
| 2948 } | |
| 2949 | |
|
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|
2950 void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { |
|
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|
2951 clearRangePrevBitmap(mr); |
|
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|
2952 clearRangeNextBitmap(mr); |
|
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|
2953 } |
|
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|
2954 |
| 342 | 2955 HeapRegion* |
|
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|
2956 ConcurrentMark::claim_region(uint worker_id) { |
| 342 | 2957 // "checkpoint" the finger |
| 2958 HeapWord* finger = _finger; | |
| 2959 | |
| 2960 // _heap_end will not change underneath our feet; it only changes at | |
| 2961 // yield points. | |
| 2962 while (finger < _heap_end) { | |
|
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|
2963 assert(_g1h->is_in_g1_reserved(finger), "invariant"); |
| 342 | 2964 |
| 3771 | 2965 // Note on how this code handles humongous regions. In the |
| 2966 // normal case the finger will reach the start of a "starts | |
| 2967 // humongous" (SH) region. Its end will either be the end of the | |
| 2968 // last "continues humongous" (CH) region in the sequence, or the | |
| 2969 // standard end of the SH region (if the SH is the only region in | |
| 2970 // the sequence). That way claim_region() will skip over the CH | |
| 2971 // regions. However, there is a subtle race between a CM thread | |
| 2972 // executing this method and a mutator thread doing a humongous | |
| 2973 // object allocation. The two are not mutually exclusive as the CM | |
| 2974 // thread does not need to hold the Heap_lock when it gets | |
| 2975 // here. So there is a chance that claim_region() will come across | |
| 2976 // a free region that's in the progress of becoming a SH or a CH | |
| 2977 // region. In the former case, it will either | |
| 2978 // a) Miss the update to the region's end, in which case it will | |
| 2979 // visit every subsequent CH region, will find their bitmaps | |
| 2980 // empty, and do nothing, or | |
| 2981 // b) Will observe the update of the region's end (in which case | |
| 2982 // it will skip the subsequent CH regions). | |
| 2983 // If it comes across a region that suddenly becomes CH, the | |
| 2984 // scenario will be similar to b). So, the race between | |
| 2985 // claim_region() and a humongous object allocation might force us | |
| 2986 // to do a bit of unnecessary work (due to some unnecessary bitmap | |
| 2987 // iterations) but it should not introduce and correctness issues. | |
| 20337 | 2988 HeapRegion* curr_region = _g1h->heap_region_containing_raw(finger); |
| 2989 | |
| 2990 // Above heap_region_containing_raw may return NULL as we always scan claim | |
| 2991 // until the end of the heap. In this case, just jump to the next region. | |
| 2992 HeapWord* end = curr_region != NULL ? curr_region->end() : finger + HeapRegion::GrainWords; | |
| 3771 | 2993 |
| 2994 // Is the gap between reading the finger and doing the CAS too long? | |
| 2995 HeapWord* res = (HeapWord*) Atomic::cmpxchg_ptr(end, &_finger, finger); | |
| 20337 | 2996 if (res == finger && curr_region != NULL) { |
| 342 | 2997 // we succeeded |
| 20337 | 2998 HeapWord* bottom = curr_region->bottom(); |
| 2999 HeapWord* limit = curr_region->next_top_at_mark_start(); | |
| 3000 | |
| 3001 if (verbose_low()) { | |
| 3002 gclog_or_tty->print_cr("[%u] curr_region = "PTR_FORMAT" " | |
| 3003 "["PTR_FORMAT", "PTR_FORMAT"), " | |
| 3004 "limit = "PTR_FORMAT, | |
| 3005 worker_id, p2i(curr_region), p2i(bottom), p2i(end), p2i(limit)); | |
| 3006 } | |
| 342 | 3007 |
| 3008 // notice that _finger == end cannot be guaranteed here since, | |
| 3009 // someone else might have moved the finger even further | |
|
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|
3010 assert(_finger >= end, "the finger should have moved forward"); |
| 342 | 3011 |
|
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|
3012 if (verbose_low()) { |
|
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|
3013 gclog_or_tty->print_cr("[%u] we were successful with region = " |
|
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|
3014 PTR_FORMAT, worker_id, p2i(curr_region)); |
|
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|
3015 } |
| 342 | 3016 |
| 3017 if (limit > bottom) { | |
|
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|
3018 if (verbose_low()) { |
|
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|
3019 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is not empty, " |
|
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|
3020 "returning it ", worker_id, p2i(curr_region)); |
|
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|
3021 } |
| 342 | 3022 return curr_region; |
| 3023 } else { | |
|
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6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3024 assert(limit == bottom, |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3025 "the region limit should be at bottom"); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3026 if (verbose_low()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3027 gclog_or_tty->print_cr("[%u] region "PTR_FORMAT" is empty, " |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
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17844
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|
3028 "returning NULL", worker_id, p2i(curr_region)); |
|
3776
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7055073: G1: code cleanup in the concurrentMark.* files
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diff
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|
3029 } |
| 342 | 3030 // we return NULL and the caller should try calling |
| 3031 // claim_region() again. | |
| 3032 return NULL; | |
| 3033 } | |
| 3034 } else { | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
3035 assert(_finger > finger, "the finger should have moved forward"); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
3036 if (verbose_low()) { |
| 20337 | 3037 if (curr_region == NULL) { |
| 3038 gclog_or_tty->print_cr("[%u] found uncommitted region, moving finger, " | |
| 3039 "global finger = "PTR_FORMAT", " | |
| 3040 "our finger = "PTR_FORMAT, | |
| 3041 worker_id, p2i(_finger), p2i(finger)); | |
| 3042 } else { | |
| 3043 gclog_or_tty->print_cr("[%u] somebody else moved the finger, " | |
| 3044 "global finger = "PTR_FORMAT", " | |
| 3045 "our finger = "PTR_FORMAT, | |
| 3046 worker_id, p2i(_finger), p2i(finger)); | |
| 3047 } | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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parents:
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diff
changeset
|
3048 } |
| 342 | 3049 |
| 3050 // read it again | |
| 3051 finger = _finger; | |
| 3052 } | |
| 3053 } | |
| 3054 | |
| 3055 return NULL; | |
| 3056 } | |
| 3057 | |
|
4787
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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|
3058 #ifndef PRODUCT |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3059 enum VerifyNoCSetOopsPhase { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
3060 VerifyNoCSetOopsStack, |
|
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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|
3061 VerifyNoCSetOopsQueues, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
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|
3062 VerifyNoCSetOopsSATBCompleted, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3063 VerifyNoCSetOopsSATBThread |
|
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3064 }; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3065 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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|
3066 class VerifyNoCSetOopsClosure : public OopClosure, public ObjectClosure { |
|
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|
3067 private: |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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|
3068 G1CollectedHeap* _g1h; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3069 VerifyNoCSetOopsPhase _phase; |
|
2ace1c4ee8da
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|
3070 int _info; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3071 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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|
3072 const char* phase_str() { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3073 switch (_phase) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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changeset
|
3074 case VerifyNoCSetOopsStack: return "Stack"; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3075 case VerifyNoCSetOopsQueues: return "Queue"; |
|
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3076 case VerifyNoCSetOopsSATBCompleted: return "Completed SATB Buffers"; |
|
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6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3077 case VerifyNoCSetOopsSATBThread: return "Thread SATB Buffers"; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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|
3078 default: ShouldNotReachHere(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
3079 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
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diff
changeset
|
3080 return NULL; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3081 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3082 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3083 void do_object_work(oop obj) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3084 guarantee(!_g1h->obj_in_cs(obj), |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3085 err_msg("obj: "PTR_FORMAT" in CSet, phase: %s, info: %d", |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
3086 p2i((void*) obj), phase_str(), _info)); |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
changeset
|
3087 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3088 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3089 public: |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3090 VerifyNoCSetOopsClosure() : _g1h(G1CollectedHeap::heap()) { } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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|
3091 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3092 void set_phase(VerifyNoCSetOopsPhase phase, int info = -1) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3093 _phase = phase; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3094 _info = info; |
|
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_oop(oop* p) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3098 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
|
3099 do_object_work(obj); |
|
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 virtual void do_oop(narrowOop* p) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3103 // 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
|
3104 // stacks and SATB buffers. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3105 ShouldNotReachHere(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3106 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3107 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3108 virtual void do_object(oop obj) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3109 do_object_work(obj); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3110 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3111 }; |
|
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 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
|
3114 bool verify_enqueued_buffers, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3115 bool verify_thread_buffers, |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3116 bool verify_fingers) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3117 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
|
3118 if (!G1CollectedHeap::heap()->mark_in_progress()) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3119 return; |
| 342 | 3120 } |
|
1835
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3121 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3122 VerifyNoCSetOopsClosure 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 if (verify_stacks) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3125 // Verify entries on the global mark stack |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3126 cl.set_phase(VerifyNoCSetOopsStack); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3127 _markStack.oops_do(&cl); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3128 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3129 // 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
|
3130 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
|
3131 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
|
3132 CMTaskQueue* queue = _task_queues->queue(i); |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3133 queue->oops_do(&cl); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3134 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3135 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3136 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3137 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
|
3138 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3139 // Verify entries on the enqueued SATB buffers |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3140 if (verify_enqueued_buffers) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3141 cl.set_phase(VerifyNoCSetOopsSATBCompleted); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3142 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
|
3143 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3144 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3145 // 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
|
3146 if (verify_thread_buffers) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3147 cl.set_phase(VerifyNoCSetOopsSATBThread); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3148 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
|
3149 } |
|
4805b9f4779e
6941395: G1: Use only lock-free versions of region stack push() and pop()
johnc
parents:
1833
diff
changeset
|
3150 |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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parents:
4783
diff
changeset
|
3151 if (verify_fingers) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3152 // Verify the global finger |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3153 HeapWord* global_finger = finger(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3154 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
|
3155 // 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
|
3156 // 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
|
3157 // 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
|
3158 // which subsequently becomes continues humongous. If that |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3159 // 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
|
3160 // 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
|
3161 // not hold any more. |
| 20337 | 3162 // Since we always iterate over all regions, we might get a NULL HeapRegion |
| 3163 // here. | |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3164 HeapRegion* global_hr = _g1h->heap_region_containing_raw(global_finger); |
| 20337 | 3165 guarantee(global_hr == NULL || global_finger == global_hr->bottom(), |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3166 err_msg("global finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
3167 p2i(global_finger), HR_FORMAT_PARAMS(global_hr))); |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3168 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3169 |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3170 // Verify the task fingers |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3171 assert(parallel_marking_threads() <= _max_worker_id, "sanity"); |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3172 for (int i = 0; i < (int) parallel_marking_threads(); i += 1) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3173 CMTask* task = _tasks[i]; |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3174 HeapWord* task_finger = task->finger(); |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3175 if (task_finger != NULL && task_finger < _heap_end) { |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3176 // See above note on the global finger verification. |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3177 HeapRegion* task_hr = _g1h->heap_region_containing_raw(task_finger); |
| 20337 | 3178 guarantee(task_hr == NULL || task_finger == task_hr->bottom() || |
|
4787
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
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diff
changeset
|
3179 !task_hr->in_collection_set(), |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
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diff
changeset
|
3180 err_msg("task finger: "PTR_FORMAT" region: "HR_FORMAT, |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
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diff
changeset
|
3181 p2i(task_finger), HR_FORMAT_PARAMS(task_hr))); |
|
4787
2ace1c4ee8da
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4783
diff
changeset
|
3182 } |
|
2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
4783
diff
changeset
|
3183 } |
|
2ace1c4ee8da
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parents:
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diff
changeset
|
3184 } |
| 342 | 3185 } |
|
4787
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changeset
|
3186 #endif // PRODUCT |
| 342 | 3187 |
|
4836
d30fa85f9994
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|
3188 // Aggregate the counting data that was constructed concurrently |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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4830
diff
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|
3189 // with marking. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
3190 class AggregateCountDataHRClosure: public HeapRegionClosure { |
|
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
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diff
changeset
|
3191 G1CollectedHeap* _g1h; |
|
4836
d30fa85f9994
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diff
changeset
|
3192 ConcurrentMark* _cm; |
|
6812
988bf00cc564
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diff
changeset
|
3193 CardTableModRefBS* _ct_bs; |
|
4836
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changeset
|
3194 BitMap* _cm_card_bm; |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
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parents:
6812
diff
changeset
|
3195 uint _max_worker_id; |
|
4836
d30fa85f9994
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changeset
|
3196 |
|
d30fa85f9994
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diff
changeset
|
3197 public: |
|
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
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changeset
|
3198 AggregateCountDataHRClosure(G1CollectedHeap* g1h, |
|
4836
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changeset
|
3199 BitMap* cm_card_bm, |
|
6862
8a5ea0a9ccc4
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parents:
6812
diff
changeset
|
3200 uint max_worker_id) : |
|
6812
988bf00cc564
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changeset
|
3201 _g1h(g1h), _cm(g1h->concurrent_mark()), |
|
988bf00cc564
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changeset
|
3202 _ct_bs((CardTableModRefBS*) (g1h->barrier_set())), |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
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diff
changeset
|
3203 _cm_card_bm(cm_card_bm), _max_worker_id(max_worker_id) { } |
|
4836
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changeset
|
3204 |
|
d30fa85f9994
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4830
diff
changeset
|
3205 bool doHeapRegion(HeapRegion* hr) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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changeset
|
3206 if (hr->continuesHumongous()) { |
|
d30fa85f9994
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diff
changeset
|
3207 // We will ignore these here and process them when their |
|
d30fa85f9994
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4830
diff
changeset
|
3208 // associated "starts humongous" region is processed. |
|
d30fa85f9994
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4830
diff
changeset
|
3209 // Note that we cannot rely on their associated |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
3210 // "starts humongous" region to have their bit set to 1 |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
3211 // since, due to the region chunking in the parallel region |
|
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3212 // iteration, a "continues humongous" region might be visited |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3213 // before its associated "starts humongous". |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3214 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3215 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3216 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3217 HeapWord* start = hr->bottom(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3218 HeapWord* limit = hr->next_top_at_mark_start(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3219 HeapWord* end = hr->end(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3220 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3221 assert(start <= limit && limit <= hr->top() && hr->top() <= hr->end(), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3222 err_msg("Preconditions not met - " |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3223 "start: "PTR_FORMAT", limit: "PTR_FORMAT", " |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3224 "top: "PTR_FORMAT", end: "PTR_FORMAT, |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
3225 p2i(start), p2i(limit), p2i(hr->top()), p2i(hr->end()))); |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3226 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3227 assert(hr->next_marked_bytes() == 0, "Precondition"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3228 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3229 if (start == limit) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3230 // 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
|
3231 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3232 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3233 |
|
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3234 // 'start' should be in the heap. |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3235 assert(_g1h->is_in_g1_reserved(start) && _ct_bs->is_card_aligned(start), "sanity"); |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3236 // 'end' *may* be just beyone the end of the heap (if hr is the last region) |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3237 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
|
3238 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3239 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
|
3240 BitMap::idx_t limit_idx = _cm->card_bitmap_index_for(limit); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3241 BitMap::idx_t end_idx = _cm->card_bitmap_index_for(end); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3242 |
|
6812
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3243 // If ntams is not card aligned then we bump card bitmap index |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3244 // 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
|
3245 // the object ending at ntams. |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3246 // Note: if this is the last region in the heap then ntams |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3247 // could be actually just beyond the end of the the heap; |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3248 // limit_idx will then correspond to a (non-existent) card |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3249 // that is also outside the heap. |
|
988bf00cc564
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
6750
diff
changeset
|
3250 if (_g1h->is_in_g1_reserved(limit) && !_ct_bs->is_card_aligned(limit)) { |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3251 limit_idx += 1; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3252 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3253 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3254 assert(limit_idx <= end_idx, "or else use atomics"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3255 |
|
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3256 // Aggregate the "stripe" in the count data associated with hr. |
|
20377
a8ea2f110d87
8054819: Rename HeapRegionSeq to HeapRegionManager
tschatzl
parents:
20337
diff
changeset
|
3257 uint hrm_index = hr->hrm_index(); |
|
4836
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parents:
4830
diff
changeset
|
3258 size_t marked_bytes = 0; |
|
d30fa85f9994
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4830
diff
changeset
|
3259 |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3260 for (uint i = 0; i < _max_worker_id; i += 1) { |
|
4836
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4830
diff
changeset
|
3261 size_t* marked_bytes_array = _cm->count_marked_bytes_array_for(i); |
|
d30fa85f9994
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4830
diff
changeset
|
3262 BitMap* task_card_bm = _cm->count_card_bitmap_for(i); |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
3263 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3264 // Fetch the marked_bytes in this region for task i and |
|
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3265 // add it to the running total for this region. |
|
20377
a8ea2f110d87
8054819: Rename HeapRegionSeq to HeapRegionManager
tschatzl
parents:
20337
diff
changeset
|
3266 marked_bytes += marked_bytes_array[hrm_index]; |
|
4836
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4830
diff
changeset
|
3267 |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3268 // Now union the bitmaps[0,max_worker_id)[start_idx..limit_idx) |
|
4836
d30fa85f9994
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4830
diff
changeset
|
3269 // into the global card bitmap. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3270 BitMap::idx_t scan_idx = task_card_bm->get_next_one_offset(start_idx, limit_idx); |
|
d30fa85f9994
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4830
diff
changeset
|
3271 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3272 while (scan_idx < limit_idx) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3273 assert(task_card_bm->at(scan_idx) == true, "should be"); |
|
d30fa85f9994
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johnc
parents:
4830
diff
changeset
|
3274 _cm_card_bm->set_bit(scan_idx); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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4830
diff
changeset
|
3275 assert(_cm_card_bm->at(scan_idx) == true, "should be"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3276 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
4830
diff
changeset
|
3277 // BitMap::get_next_one_offset() can handle the case when |
|
d30fa85f9994
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parents:
4830
diff
changeset
|
3278 // its left_offset parameter is greater than its right_offset |
|
6812
988bf00cc564
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parents:
6750
diff
changeset
|
3279 // parameter. It does, however, have an early exit if |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3280 // 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
|
3281 // passed in for left offset here. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3282 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
|
3283 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
|
3284 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3285 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3286 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3287 // Update the marked bytes for this region. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3288 hr->add_to_marked_bytes(marked_bytes); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3289 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3290 // Next heap region |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3291 return false; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3292 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3293 }; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3294 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3295 class G1AggregateCountDataTask: public AbstractGangTask { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3296 protected: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3297 G1CollectedHeap* _g1h; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3298 ConcurrentMark* _cm; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3299 BitMap* _cm_card_bm; |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3300 uint _max_worker_id; |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3301 int _active_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 public: |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3304 G1AggregateCountDataTask(G1CollectedHeap* g1h, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3305 ConcurrentMark* cm, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3306 BitMap* cm_card_bm, |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3307 uint max_worker_id, |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3308 int n_workers) : |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3309 AbstractGangTask("Count Aggregation"), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3310 _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
|
3311 _max_worker_id(max_worker_id), |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3312 _active_workers(n_workers) { } |
|
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 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
|
3315 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
|
3316 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3317 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3318 _g1h->heap_region_par_iterate_chunked(&cl, worker_id, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3319 _active_workers, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3320 HeapRegion::AggregateCountClaimValue); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3321 } else { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3322 _g1h->heap_region_iterate(&cl); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3323 } |
|
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 }; |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3326 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3327 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3328 void ConcurrentMark::aggregate_count_data() { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3329 int n_workers = (G1CollectedHeap::use_parallel_gc_threads() ? |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3330 _g1h->workers()->active_workers() : |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3331 1); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3332 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3333 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
|
3334 _max_worker_id, n_workers); |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3335 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3336 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3337 assert(_g1h->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3338 "sanity check"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3339 _g1h->set_par_threads(n_workers); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3340 _g1h->workers()->run_task(&g1_par_agg_task); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3341 _g1h->set_par_threads(0); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3342 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3343 assert(_g1h->check_heap_region_claim_values(HeapRegion::AggregateCountClaimValue), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3344 "sanity check"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3345 _g1h->reset_heap_region_claim_values(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3346 } else { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3347 g1_par_agg_task.work(0); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3348 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3349 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3350 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3351 // 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
|
3352 void ConcurrentMark::clear_all_count_data() { |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3353 // 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
|
3354 // liveness count aggregation (during remark) and the |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3355 // final counting task. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3356 _card_bm.clear(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3357 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3358 // 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
|
3359 // of the final counting task. |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3360 _region_bm.clear(); |
|
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 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
|
3363 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
|
3364 |
|
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3365 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
|
3366 BitMap* task_card_bm = count_card_bitmap_for(i); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3367 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
|
3368 |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3369 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
|
3370 assert(marked_bytes_array != NULL, "uninitialized"); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3371 |
|
6010
720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
tonyp
parents:
6008
diff
changeset
|
3372 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
|
3373 task_card_bm->clear(); |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3374 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3375 } |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3376 |
| 342 | 3377 void ConcurrentMark::print_stats() { |
| 3378 if (verbose_stats()) { | |
| 3379 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3380 for (size_t i = 0; i < _active_tasks; ++i) { | |
| 3381 _tasks[i]->print_stats(); | |
| 3382 gclog_or_tty->print_cr("---------------------------------------------------------------------"); | |
| 3383 } | |
| 3384 } | |
| 3385 } | |
| 3386 | |
| 3387 // abandon current marking iteration due to a Full GC | |
| 3388 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
|
3389 // 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
|
3390 // concurrent bitmap clearing. |
| 342 | 3391 _nextMarkBitMap->clearAll(); |
|
20291
e0954897238a
7132678: G1: verify that the marking bitmaps have no marks for objects over TAMS
brutisso
parents:
20282
diff
changeset
|
3392 |
|
e0954897238a
7132678: G1: verify that the marking bitmaps have no marks for objects over TAMS
brutisso
parents:
20282
diff
changeset
|
3393 // 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
|
3394 // 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
|
3395 // 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
|
3396 |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3397 // Clear the liveness counting data |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
3398 clear_all_count_data(); |
| 342 | 3399 // Empty mark stack |
|
7450
d275c3dc73e6
8004816: G1: Kitchensink failures after marking stack changes
johnc
parents:
7397
diff
changeset
|
3400 reset_marking_state(); |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
3401 for (uint i = 0; i < _max_worker_id; ++i) { |
| 342 | 3402 _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
|
3403 } |
|
17949
487f09bf44e0
8040803: G1: Concurrent mark hangs when mark stack overflows
pliden
parents:
17937
diff
changeset
|
3404 _first_overflow_barrier_sync.abort(); |
|
487f09bf44e0
8040803: G1: Concurrent mark hangs when mark stack overflows
pliden
parents:
17937
diff
changeset
|
3405 _second_overflow_barrier_sync.abort(); |
|
20190
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
3406 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
|
3407 if (!gc_id.is_undefined()) { |
|
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
3408 // 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
|
3409 // to detect that it was aborted. Only keep track of the first GC id that we aborted. |
|
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
3410 _aborted_gc_id = gc_id; |
|
0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
17950
diff
changeset
|
3411 } |
| 342 | 3412 _has_aborted = true; |
| 3413 | |
| 3414 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3415 satb_mq_set.abandon_partial_marking(); | |
|
1317
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
3416 // This can be called either during or outside marking, we'll read |
|
d4197f8d516a
6935821: G1: threads created during marking do not active their SATB queues
tonyp
parents:
1314
diff
changeset
|
3417 // the expected_active value from the SATB queue set. |
|
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|
3418 satb_mq_set.set_active_all_threads( |
|
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|
3419 false, /* new active value */ |
|
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|
3420 satb_mq_set.is_active() /* expected_active */); |
| 10405 | 3421 |
| 3422 _g1h->trace_heap_after_concurrent_cycle(); | |
| 3423 _g1h->register_concurrent_cycle_end(); | |
| 342 | 3424 } |
| 3425 | |
|
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|
3426 const GCId& ConcurrentMark::concurrent_gc_id() { |
|
0982ec23da03
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|
3427 if (has_aborted()) { |
|
0982ec23da03
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|
3428 return _aborted_gc_id; |
|
0982ec23da03
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|
3429 } |
|
0982ec23da03
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|
3430 return _g1h->gc_tracer_cm()->gc_id(); |
|
0982ec23da03
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|
3431 } |
|
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|
3432 |
| 342 | 3433 static void print_ms_time_info(const char* prefix, const char* name, |
| 3434 NumberSeq& ns) { | |
| 3435 gclog_or_tty->print_cr("%s%5d %12s: total time = %8.2f s (avg = %8.2f ms).", | |
| 3436 prefix, ns.num(), name, ns.sum()/1000.0, ns.avg()); | |
| 3437 if (ns.num() > 0) { | |
| 3438 gclog_or_tty->print_cr("%s [std. dev = %8.2f ms, max = %8.2f ms]", | |
| 3439 prefix, ns.sd(), ns.maximum()); | |
| 3440 } | |
| 3441 } | |
| 3442 | |
| 3443 void ConcurrentMark::print_summary_info() { | |
| 3444 gclog_or_tty->print_cr(" Concurrent marking:"); | |
| 3445 print_ms_time_info(" ", "init marks", _init_times); | |
| 3446 print_ms_time_info(" ", "remarks", _remark_times); | |
| 3447 { | |
| 3448 print_ms_time_info(" ", "final marks", _remark_mark_times); | |
| 3449 print_ms_time_info(" ", "weak refs", _remark_weak_ref_times); | |
| 3450 | |
| 3451 } | |
| 3452 print_ms_time_info(" ", "cleanups", _cleanup_times); | |
| 3453 gclog_or_tty->print_cr(" Final counting total time = %8.2f s (avg = %8.2f ms).", | |
| 3454 _total_counting_time, | |
| 3455 (_cleanup_times.num() > 0 ? _total_counting_time * 1000.0 / | |
| 3456 (double)_cleanup_times.num() | |
| 3457 : 0.0)); | |
| 3458 if (G1ScrubRemSets) { | |
| 3459 gclog_or_tty->print_cr(" RS scrub total time = %8.2f s (avg = %8.2f ms).", | |
| 3460 _total_rs_scrub_time, | |
| 3461 (_cleanup_times.num() > 0 ? _total_rs_scrub_time * 1000.0 / | |
| 3462 (double)_cleanup_times.num() | |
| 3463 : 0.0)); | |
| 3464 } | |
| 3465 gclog_or_tty->print_cr(" Total stop_world time = %8.2f s.", | |
| 3466 (_init_times.sum() + _remark_times.sum() + | |
| 3467 _cleanup_times.sum())/1000.0); | |
| 3468 gclog_or_tty->print_cr(" Total concurrent time = %8.2f s " | |
|
4836
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|
3469 "(%8.2f s marking).", |
| 342 | 3470 cmThread()->vtime_accum(), |
|
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|
3471 cmThread()->vtime_mark_accum()); |
| 342 | 3472 } |
| 3473 | |
| 1019 | 3474 void ConcurrentMark::print_worker_threads_on(outputStream* st) const { |
|
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|
3475 if (use_parallel_marking_threads()) { |
|
256d3f43c177
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|
3476 _parallel_workers->print_worker_threads_on(st); |
|
256d3f43c177
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|
3477 } |
| 1019 | 3478 } |
| 3479 | |
|
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|
3480 void ConcurrentMark::print_on_error(outputStream* st) const { |
|
7b835924c31c
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|
3481 st->print_cr("Marking Bits (Prev, Next): (CMBitMap*) " PTR_FORMAT ", (CMBitMap*) " PTR_FORMAT, |
|
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|
3482 p2i(_prevMarkBitMap), p2i(_nextMarkBitMap)); |
|
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|
3483 _prevMarkBitMap->print_on_error(st, " Prev Bits: "); |
|
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|
3484 _nextMarkBitMap->print_on_error(st, " Next Bits: "); |
|
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|
3485 } |
|
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|
3486 |
| 342 | 3487 // We take a break if someone is trying to stop the world. |
|
4728
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|
3488 bool ConcurrentMark::do_yield_check(uint worker_id) { |
| 20192 | 3489 if (SuspendibleThreadSet::should_yield()) { |
|
4728
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|
3490 if (worker_id == 0) { |
| 342 | 3491 _g1h->g1_policy()->record_concurrent_pause(); |
|
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|
3492 } |
| 20192 | 3493 SuspendibleThreadSet::yield(); |
| 342 | 3494 return true; |
| 3495 } else { | |
| 3496 return false; | |
| 3497 } | |
| 3498 } | |
| 3499 | |
| 3500 bool ConcurrentMark::containing_card_is_marked(void* p) { | |
| 3501 size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); | |
| 3502 return _card_bm.at(offset >> CardTableModRefBS::card_shift); | |
| 3503 } | |
| 3504 | |
| 3505 bool ConcurrentMark::containing_cards_are_marked(void* start, | |
| 3506 void* last) { | |
|
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|
3507 return containing_card_is_marked(start) && |
|
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|
3508 containing_card_is_marked(last); |
| 342 | 3509 } |
| 3510 | |
| 3511 #ifndef PRODUCT | |
| 3512 // for debugging purposes | |
| 3513 void ConcurrentMark::print_finger() { | |
| 3514 gclog_or_tty->print_cr("heap ["PTR_FORMAT", "PTR_FORMAT"), global finger = "PTR_FORMAT, | |
|
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|
3515 p2i(_heap_start), p2i(_heap_end), p2i(_finger)); |
|
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|
3516 for (uint i = 0; i < _max_worker_id; ++i) { |
|
17937
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|
3517 gclog_or_tty->print(" %u: " PTR_FORMAT, i, p2i(_tasks[i]->finger())); |
| 342 | 3518 } |
|
17937
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|
3519 gclog_or_tty->cr(); |
| 342 | 3520 } |
| 3521 #endif | |
| 3522 | |
| 3771 | 3523 void CMTask::scan_object(oop obj) { |
| 3524 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), "invariant"); | |
| 3525 | |
| 3526 if (_cm->verbose_high()) { | |
|
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|
3527 gclog_or_tty->print_cr("[%u] we're scanning object "PTR_FORMAT, |
|
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|
3528 _worker_id, p2i((void*) obj)); |
| 3771 | 3529 } |
| 3530 | |
| 3531 size_t obj_size = obj->size(); | |
| 3532 _words_scanned += obj_size; | |
| 3533 | |
| 3534 obj->oop_iterate(_cm_oop_closure); | |
| 3535 statsOnly( ++_objs_scanned ); | |
| 3536 check_limits(); | |
| 3537 } | |
| 3538 | |
| 342 | 3539 // Closure for iteration over bitmaps |
| 3540 class CMBitMapClosure : public BitMapClosure { | |
| 3541 private: | |
| 3542 // the bitmap that is being iterated over | |
| 3543 CMBitMap* _nextMarkBitMap; | |
| 3544 ConcurrentMark* _cm; | |
| 3545 CMTask* _task; | |
| 3546 | |
| 3547 public: | |
|
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|
3548 CMBitMapClosure(CMTask *task, ConcurrentMark* cm, CMBitMap* nextMarkBitMap) : |
|
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|
3549 _task(task), _cm(cm), _nextMarkBitMap(nextMarkBitMap) { } |
| 342 | 3550 |
| 3551 bool do_bit(size_t offset) { | |
| 3552 HeapWord* addr = _nextMarkBitMap->offsetToHeapWord(offset); | |
|
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|
3553 assert(_nextMarkBitMap->isMarked(addr), "invariant"); |
|
11d4857fe5e1
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|
3554 assert( addr < _cm->finger(), "invariant"); |
| 342 | 3555 |
|
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|
3556 statsOnly( _task->increase_objs_found_on_bitmap() ); |
|
2a0172480595
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|
3557 assert(addr >= _task->finger(), "invariant"); |
|
2a0172480595
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|
3558 |
|
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|
3559 // We move that task's local finger along. |
|
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changeset
|
3560 _task->move_finger_to(addr); |
| 342 | 3561 |
| 3562 _task->scan_object(oop(addr)); | |
| 3563 // we only partially drain the local queue and global stack | |
| 3564 _task->drain_local_queue(true); | |
| 3565 _task->drain_global_stack(true); | |
| 3566 | |
| 3567 // if the has_aborted flag has been raised, we need to bail out of | |
| 3568 // the iteration | |
| 3569 return !_task->has_aborted(); | |
| 3570 } | |
| 3571 }; | |
| 3572 | |
| 3771 | 3573 G1CMOopClosure::G1CMOopClosure(G1CollectedHeap* g1h, |
| 3574 ConcurrentMark* cm, | |
| 3575 CMTask* task) | |
| 3576 : _g1h(g1h), _cm(cm), _task(task) { | |
| 3577 assert(_ref_processor == NULL, "should be initialized to NULL"); | |
| 3578 | |
| 3579 if (G1UseConcMarkReferenceProcessing) { | |
|
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
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3977
diff
changeset
|
3580 _ref_processor = g1h->ref_processor_cm(); |
| 3771 | 3581 assert(_ref_processor != NULL, "should not be NULL"); |
| 342 | 3582 } |
| 3771 | 3583 } |
| 342 | 3584 |
| 3585 void CMTask::setup_for_region(HeapRegion* hr) { | |
|
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changeset
|
3586 assert(hr != NULL, |
|
20335
eec72fa4b108
8040722: G1: Clean up usages of heap_region_containing
brutisso
parents:
20310
diff
changeset
|
3587 "claim_region() should have filtered out NULL regions"); |
|
1023
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1022
diff
changeset
|
3588 assert(!hr->continuesHumongous(), |
|
11d4857fe5e1
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diff
changeset
|
3589 "claim_region() should have filtered out continues humongous regions"); |
| 342 | 3590 |
|
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|
3591 if (_cm->verbose_low()) { |
|
6862
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|
3592 gclog_or_tty->print_cr("[%u] setting up for region "PTR_FORMAT, |
|
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|
3593 _worker_id, p2i(hr)); |
|
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|
3594 } |
| 342 | 3595 |
| 3596 _curr_region = hr; | |
| 3597 _finger = hr->bottom(); | |
| 3598 update_region_limit(); | |
| 3599 } | |
| 3600 | |
| 3601 void CMTask::update_region_limit() { | |
| 3602 HeapRegion* hr = _curr_region; | |
| 3603 HeapWord* bottom = hr->bottom(); | |
| 3604 HeapWord* limit = hr->next_top_at_mark_start(); | |
| 3605 | |
| 3606 if (limit == bottom) { | |
|
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|
3607 if (_cm->verbose_low()) { |
|
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|
3608 gclog_or_tty->print_cr("[%u] found an empty region " |
| 342 | 3609 "["PTR_FORMAT", "PTR_FORMAT")", |
|
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|
3610 _worker_id, p2i(bottom), p2i(limit)); |
|
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|
3611 } |
| 342 | 3612 // The region was collected underneath our feet. |
| 3613 // We set the finger to bottom to ensure that the bitmap | |
| 3614 // iteration that will follow this will not do anything. | |
| 3615 // (this is not a condition that holds when we set the region up, | |
| 3616 // as the region is not supposed to be empty in the first place) | |
| 3617 _finger = bottom; | |
| 3618 } else if (limit >= _region_limit) { | |
|
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|
3619 assert(limit >= _finger, "peace of mind"); |
| 342 | 3620 } else { |
|
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changeset
|
3621 assert(limit < _region_limit, "only way to get here"); |
| 342 | 3622 // This can happen under some pretty unusual circumstances. An |
| 3623 // evacuation pause empties the region underneath our feet (NTAMS | |
| 3624 // at bottom). We then do some allocation in the region (NTAMS | |
| 3625 // stays at bottom), followed by the region being used as a GC | |
| 3626 // alloc region (NTAMS will move to top() and the objects | |
| 3627 // originally below it will be grayed). All objects now marked in | |
| 3628 // the region are explicitly grayed, if below the global finger, | |
| 3629 // and we do not need in fact to scan anything else. So, we simply | |
| 3630 // set _finger to be limit to ensure that the bitmap iteration | |
| 3631 // doesn't do anything. | |
| 3632 _finger = limit; | |
| 3633 } | |
| 3634 | |
| 3635 _region_limit = limit; | |
| 3636 } | |
| 3637 | |
| 3638 void CMTask::giveup_current_region() { | |
|
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|
3639 assert(_curr_region != NULL, "invariant"); |
|
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|
3640 if (_cm->verbose_low()) { |
|
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|
3641 gclog_or_tty->print_cr("[%u] giving up region "PTR_FORMAT, |
|
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|
3642 _worker_id, p2i(_curr_region)); |
|
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|
3643 } |
| 342 | 3644 clear_region_fields(); |
| 3645 } | |
| 3646 | |
| 3647 void CMTask::clear_region_fields() { | |
| 3648 // Values for these three fields that indicate that we're not | |
| 3649 // holding on to a region. | |
| 3650 _curr_region = NULL; | |
| 3651 _finger = NULL; | |
| 3652 _region_limit = NULL; | |
| 3653 } | |
| 3654 | |
| 3771 | 3655 void CMTask::set_cm_oop_closure(G1CMOopClosure* cm_oop_closure) { |
| 3656 if (cm_oop_closure == NULL) { | |
| 3657 assert(_cm_oop_closure != NULL, "invariant"); | |
| 3658 } else { | |
| 3659 assert(_cm_oop_closure == NULL, "invariant"); | |
| 3660 } | |
| 3661 _cm_oop_closure = cm_oop_closure; | |
| 3662 } | |
| 3663 | |
| 342 | 3664 void CMTask::reset(CMBitMap* nextMarkBitMap) { |
|
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|
3665 guarantee(nextMarkBitMap != NULL, "invariant"); |
| 342 | 3666 |
|
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|
3667 if (_cm->verbose_low()) { |
|
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|
3668 gclog_or_tty->print_cr("[%u] resetting", _worker_id); |
|
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|
3669 } |
| 342 | 3670 |
| 3671 _nextMarkBitMap = nextMarkBitMap; | |
| 3672 clear_region_fields(); | |
| 3673 | |
| 3674 _calls = 0; | |
| 3675 _elapsed_time_ms = 0.0; | |
| 3676 _termination_time_ms = 0.0; | |
| 3677 _termination_start_time_ms = 0.0; | |
| 3678 | |
| 3679 #if _MARKING_STATS_ | |
| 3680 _local_pushes = 0; | |
| 3681 _local_pops = 0; | |
| 3682 _local_max_size = 0; | |
| 3683 _objs_scanned = 0; | |
| 3684 _global_pushes = 0; | |
| 3685 _global_pops = 0; | |
| 3686 _global_max_size = 0; | |
| 3687 _global_transfers_to = 0; | |
| 3688 _global_transfers_from = 0; | |
| 3689 _regions_claimed = 0; | |
| 3690 _objs_found_on_bitmap = 0; | |
| 3691 _satb_buffers_processed = 0; | |
| 3692 _steal_attempts = 0; | |
| 3693 _steals = 0; | |
| 3694 _aborted = 0; | |
| 3695 _aborted_overflow = 0; | |
| 3696 _aborted_cm_aborted = 0; | |
| 3697 _aborted_yield = 0; | |
| 3698 _aborted_timed_out = 0; | |
| 3699 _aborted_satb = 0; | |
| 3700 _aborted_termination = 0; | |
| 3701 #endif // _MARKING_STATS_ | |
| 3702 } | |
| 3703 | |
| 3704 bool CMTask::should_exit_termination() { | |
| 3705 regular_clock_call(); | |
| 3706 // This is called when we are in the termination protocol. We should | |
| 3707 // quit if, for some reason, this task wants to abort or the global | |
| 3708 // stack is not empty (this means that we can get work from it). | |
| 3709 return !_cm->mark_stack_empty() || has_aborted(); | |
| 3710 } | |
| 3711 | |
| 3712 void CMTask::reached_limit() { | |
|
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3713 assert(_words_scanned >= _words_scanned_limit || |
|
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3714 _refs_reached >= _refs_reached_limit , |
|
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|
3715 "shouldn't have been called otherwise"); |
| 342 | 3716 regular_clock_call(); |
| 3717 } | |
| 3718 | |
| 3719 void CMTask::regular_clock_call() { | |
|
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3720 if (has_aborted()) return; |
| 342 | 3721 |
| 3722 // First, we need to recalculate the words scanned and refs reached | |
| 3723 // limits for the next clock call. | |
| 3724 recalculate_limits(); | |
| 3725 | |
| 3726 // During the regular clock call we do the following | |
| 3727 | |
| 3728 // (1) If an overflow has been flagged, then we abort. | |
| 3729 if (_cm->has_overflown()) { | |
| 3730 set_has_aborted(); | |
| 3731 return; | |
| 3732 } | |
| 3733 | |
| 3734 // If we are not concurrent (i.e. we're doing remark) we don't need | |
| 3735 // to check anything else. The other steps are only needed during | |
| 3736 // the concurrent marking phase. | |
|
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3737 if (!concurrent()) return; |
| 342 | 3738 |
| 3739 // (2) If marking has been aborted for Full GC, then we also abort. | |
| 3740 if (_cm->has_aborted()) { | |
| 3741 set_has_aborted(); | |
| 3742 statsOnly( ++_aborted_cm_aborted ); | |
| 3743 return; | |
| 3744 } | |
| 3745 | |
| 3746 double curr_time_ms = os::elapsedVTime() * 1000.0; | |
| 3747 | |
| 3748 // (3) If marking stats are enabled, then we update the step history. | |
| 3749 #if _MARKING_STATS_ | |
|
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3750 if (_words_scanned >= _words_scanned_limit) { |
| 342 | 3751 ++_clock_due_to_scanning; |
|
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3752 } |
|
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3753 if (_refs_reached >= _refs_reached_limit) { |
| 342 | 3754 ++_clock_due_to_marking; |
|
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3755 } |
| 342 | 3756 |
| 3757 double last_interval_ms = curr_time_ms - _interval_start_time_ms; | |
| 3758 _interval_start_time_ms = curr_time_ms; | |
| 3759 _all_clock_intervals_ms.add(last_interval_ms); | |
| 3760 | |
| 3761 if (_cm->verbose_medium()) { | |
|
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3762 gclog_or_tty->print_cr("[%u] regular clock, interval = %1.2lfms, " |
|
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|
3763 "scanned = %d%s, refs reached = %d%s", |
|
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3764 _worker_id, last_interval_ms, |
|
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3765 _words_scanned, |
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|
3766 (_words_scanned >= _words_scanned_limit) ? " (*)" : "", |
|
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3767 _refs_reached, |
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|
3768 (_refs_reached >= _refs_reached_limit) ? " (*)" : ""); |
| 342 | 3769 } |
| 3770 #endif // _MARKING_STATS_ | |
| 3771 | |
| 3772 // (4) We check whether we should yield. If we have to, then we abort. | |
| 20192 | 3773 if (SuspendibleThreadSet::should_yield()) { |
| 342 | 3774 // We should yield. To do this we abort the task. The caller is |
| 3775 // responsible for yielding. | |
| 3776 set_has_aborted(); | |
| 3777 statsOnly( ++_aborted_yield ); | |
| 3778 return; | |
| 3779 } | |
| 3780 | |
| 3781 // (5) We check whether we've reached our time quota. If we have, | |
| 3782 // then we abort. | |
| 3783 double elapsed_time_ms = curr_time_ms - _start_time_ms; | |
| 3784 if (elapsed_time_ms > _time_target_ms) { | |
| 3785 set_has_aborted(); | |
|
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|
3786 _has_timed_out = true; |
| 342 | 3787 statsOnly( ++_aborted_timed_out ); |
| 3788 return; | |
| 3789 } | |
| 3790 | |
| 3791 // (6) Finally, we check whether there are enough completed STAB | |
| 3792 // buffers available for processing. If there are, we abort. | |
| 3793 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
| 3794 if (!_draining_satb_buffers && satb_mq_set.process_completed_buffers()) { | |
|
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|
3795 if (_cm->verbose_low()) { |
|
6862
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|
3796 gclog_or_tty->print_cr("[%u] aborting to deal with pending SATB buffers", |
|
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|
3797 _worker_id); |
|
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|
3798 } |
| 342 | 3799 // we do need to process SATB buffers, we'll abort and restart |
| 3800 // the marking task to do so | |
| 3801 set_has_aborted(); | |
| 3802 statsOnly( ++_aborted_satb ); | |
| 3803 return; | |
| 3804 } | |
| 3805 } | |
| 3806 | |
| 3807 void CMTask::recalculate_limits() { | |
| 3808 _real_words_scanned_limit = _words_scanned + words_scanned_period; | |
| 3809 _words_scanned_limit = _real_words_scanned_limit; | |
| 3810 | |
| 3811 _real_refs_reached_limit = _refs_reached + refs_reached_period; | |
| 3812 _refs_reached_limit = _real_refs_reached_limit; | |
| 3813 } | |
| 3814 | |
| 3815 void CMTask::decrease_limits() { | |
| 3816 // This is called when we believe that we're going to do an infrequent | |
| 3817 // operation which will increase the per byte scanned cost (i.e. move | |
| 3818 // entries to/from the global stack). It basically tries to decrease the | |
| 3819 // scanning limit so that the clock is called earlier. | |
| 3820 | |
|
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|
3821 if (_cm->verbose_medium()) { |
|
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3822 gclog_or_tty->print_cr("[%u] decreasing limits", _worker_id); |
|
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|
3823 } |
| 342 | 3824 |
| 3825 _words_scanned_limit = _real_words_scanned_limit - | |
| 3826 3 * words_scanned_period / 4; | |
| 3827 _refs_reached_limit = _real_refs_reached_limit - | |
| 3828 3 * refs_reached_period / 4; | |
| 3829 } | |
| 3830 | |
| 3831 void CMTask::move_entries_to_global_stack() { | |
| 3832 // local array where we'll store the entries that will be popped | |
| 3833 // from the local queue | |
| 3834 oop buffer[global_stack_transfer_size]; | |
| 3835 | |
| 3836 int n = 0; | |
| 3837 oop obj; | |
| 3838 while (n < global_stack_transfer_size && _task_queue->pop_local(obj)) { | |
| 3839 buffer[n] = obj; | |
| 3840 ++n; | |
| 3841 } | |
| 3842 | |
| 3843 if (n > 0) { | |
| 3844 // we popped at least one entry from the local queue | |
| 3845 | |
| 3846 statsOnly( ++_global_transfers_to; _local_pops += n ); | |
| 3847 | |
| 3848 if (!_cm->mark_stack_push(buffer, n)) { | |
|
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|
3849 if (_cm->verbose_low()) { |
|
6862
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|
3850 gclog_or_tty->print_cr("[%u] aborting due to global stack overflow", |
|
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|
3851 _worker_id); |
|
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|
3852 } |
| 342 | 3853 set_has_aborted(); |
| 3854 } else { | |
| 3855 // the transfer was successful | |
| 3856 | |
|
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|
3857 if (_cm->verbose_medium()) { |
|
6862
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|
3858 gclog_or_tty->print_cr("[%u] pushed %d entries to the global stack", |
|
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|
3859 _worker_id, n); |
|
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|
3860 } |
| 342 | 3861 statsOnly( int tmp_size = _cm->mark_stack_size(); |
|
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|
3862 if (tmp_size > _global_max_size) { |
| 342 | 3863 _global_max_size = tmp_size; |
|
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|
3864 } |
| 342 | 3865 _global_pushes += n ); |
| 3866 } | |
| 3867 } | |
| 3868 | |
| 3869 // this operation was quite expensive, so decrease the limits | |
| 3870 decrease_limits(); | |
| 3871 } | |
| 3872 | |
| 3873 void CMTask::get_entries_from_global_stack() { | |
| 3874 // local array where we'll store the entries that will be popped | |
| 3875 // from the global stack. | |
| 3876 oop buffer[global_stack_transfer_size]; | |
| 3877 int n; | |
| 3878 _cm->mark_stack_pop(buffer, global_stack_transfer_size, &n); | |
|
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|
3879 assert(n <= global_stack_transfer_size, |
|
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|
3880 "we should not pop more than the given limit"); |
| 342 | 3881 if (n > 0) { |
| 3882 // yes, we did actually pop at least one entry | |
| 3883 | |
| 3884 statsOnly( ++_global_transfers_from; _global_pops += n ); | |
|
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|
3885 if (_cm->verbose_medium()) { |
|
6862
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|
3886 gclog_or_tty->print_cr("[%u] popped %d entries from the global stack", |
|
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7127708: G1: change task num types from int to uint in concurrent mark
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|
3887 _worker_id, n); |
|
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|
3888 } |
| 342 | 3889 for (int i = 0; i < n; ++i) { |
| 3890 bool success = _task_queue->push(buffer[i]); | |
| 3891 // We only call this when the local queue is empty or under a | |
| 3892 // given target limit. So, we do not expect this push to fail. | |
|
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|
3893 assert(success, "invariant"); |
| 342 | 3894 } |
| 3895 | |
| 3896 statsOnly( int tmp_size = _task_queue->size(); | |
|
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|
3897 if (tmp_size > _local_max_size) { |
| 342 | 3898 _local_max_size = tmp_size; |
|
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|
3899 } |
| 342 | 3900 _local_pushes += n ); |
| 3901 } | |
| 3902 | |
| 3903 // this operation was quite expensive, so decrease the limits | |
| 3904 decrease_limits(); | |
| 3905 } | |
| 3906 | |
| 3907 void CMTask::drain_local_queue(bool partially) { | |
|
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|
3908 if (has_aborted()) return; |
| 342 | 3909 |
| 3910 // Decide what the target size is, depending whether we're going to | |
| 3911 // drain it partially (so that other tasks can steal if they run out | |
| 3912 // of things to do) or totally (at the very end). | |
| 3913 size_t target_size; | |
|
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|
3914 if (partially) { |
| 342 | 3915 target_size = MIN2((size_t)_task_queue->max_elems()/3, GCDrainStackTargetSize); |
|
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|
3916 } else { |
| 342 | 3917 target_size = 0; |
|
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|
3918 } |
| 342 | 3919 |
| 3920 if (_task_queue->size() > target_size) { | |
|
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|
3921 if (_cm->verbose_high()) { |
|
17937
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|
3922 gclog_or_tty->print_cr("[%u] draining local queue, target size = " SIZE_FORMAT, |
|
6862
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|
3923 _worker_id, target_size); |
|
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|
3924 } |
| 342 | 3925 |
| 3926 oop obj; | |
| 3927 bool ret = _task_queue->pop_local(obj); | |
| 3928 while (ret) { | |
| 3929 statsOnly( ++_local_pops ); | |
| 3930 | |
|
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|
3931 if (_cm->verbose_high()) { |
|
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|
3932 gclog_or_tty->print_cr("[%u] popped "PTR_FORMAT, _worker_id, |
|
17937
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|
3933 p2i((void*) obj)); |
|
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|
3934 } |
| 342 | 3935 |
|
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|
3936 assert(_g1h->is_in_g1_reserved((HeapWord*) obj), "invariant" ); |
| 2361 | 3937 assert(!_g1h->is_on_master_free_list( |
| 2152 | 3938 _g1h->heap_region_containing((HeapWord*) obj)), "invariant"); |
| 342 | 3939 |
| 3940 scan_object(obj); | |
| 3941 | |
|
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|
3942 if (_task_queue->size() <= target_size || has_aborted()) { |
| 342 | 3943 ret = false; |
|
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|
3944 } else { |
| 342 | 3945 ret = _task_queue->pop_local(obj); |
|
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|
3946 } |
| 342 | 3947 } |
| 3948 | |
|
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|
3949 if (_cm->verbose_high()) { |
|
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|
3950 gclog_or_tty->print_cr("[%u] drained local queue, size = %d", |
|
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|
3951 _worker_id, _task_queue->size()); |
|
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|
3952 } |
| 342 | 3953 } |
| 3954 } | |
| 3955 | |
| 3956 void CMTask::drain_global_stack(bool partially) { | |
|
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|
3957 if (has_aborted()) return; |
| 342 | 3958 |
| 3959 // We have a policy to drain the local queue before we attempt to | |
| 3960 // drain the global stack. | |
|
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|
3961 assert(partially || _task_queue->size() == 0, "invariant"); |
| 342 | 3962 |
| 3963 // Decide what the target size is, depending whether we're going to | |
| 3964 // drain it partially (so that other tasks can steal if they run out | |
| 3965 // of things to do) or totally (at the very end). Notice that, | |
| 3966 // because we move entries from the global stack in chunks or | |
| 3967 // because another task might be doing the same, we might in fact | |
| 3968 // drop below the target. But, this is not a problem. | |
| 3969 size_t target_size; | |
|
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|
3970 if (partially) { |
| 342 | 3971 target_size = _cm->partial_mark_stack_size_target(); |
|
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|
3972 } else { |
| 342 | 3973 target_size = 0; |
|
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3974 } |
| 342 | 3975 |
| 3976 if (_cm->mark_stack_size() > target_size) { | |
|
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3977 if (_cm->verbose_low()) { |
|
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3978 gclog_or_tty->print_cr("[%u] draining global_stack, target size " SIZE_FORMAT, |
|
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3979 _worker_id, target_size); |
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3980 } |
| 342 | 3981 |
| 3982 while (!has_aborted() && _cm->mark_stack_size() > target_size) { | |
| 3983 get_entries_from_global_stack(); | |
| 3984 drain_local_queue(partially); | |
| 3985 } | |
| 3986 | |
|
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3987 if (_cm->verbose_low()) { |
|
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3988 gclog_or_tty->print_cr("[%u] drained global stack, size = " SIZE_FORMAT, |
|
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3989 _worker_id, _cm->mark_stack_size()); |
|
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3990 } |
| 342 | 3991 } |
| 3992 } | |
| 3993 | |
| 3994 // SATB Queue has several assumptions on whether to call the par or | |
| 3995 // non-par versions of the methods. this is why some of the code is | |
| 3996 // replicated. We should really get rid of the single-threaded version | |
| 3997 // of the code to simplify things. | |
| 3998 void CMTask::drain_satb_buffers() { | |
|
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3999 if (has_aborted()) return; |
| 342 | 4000 |
| 4001 // We set this so that the regular clock knows that we're in the | |
| 4002 // middle of draining buffers and doesn't set the abort flag when it | |
| 4003 // notices that SATB buffers are available for draining. It'd be | |
| 4004 // very counter productive if it did that. :-) | |
| 4005 _draining_satb_buffers = true; | |
| 4006 | |
| 4007 CMObjectClosure oc(this); | |
| 4008 SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set(); | |
|
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4009 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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4010 satb_mq_set.set_par_closure(_worker_id, &oc); |
|
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4011 } else { |
| 342 | 4012 satb_mq_set.set_closure(&oc); |
|
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4013 } |
| 342 | 4014 |
| 4015 // This keeps claiming and applying the closure to completed buffers | |
| 4016 // until we run out of buffers or we need to abort. | |
|
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4017 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 4018 while (!has_aborted() && |
|
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4019 satb_mq_set.par_apply_closure_to_completed_buffer(_worker_id)) { |
|
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4020 if (_cm->verbose_medium()) { |
|
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4021 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
|
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4022 } |
| 342 | 4023 statsOnly( ++_satb_buffers_processed ); |
| 4024 regular_clock_call(); | |
| 4025 } | |
| 4026 } else { | |
| 4027 while (!has_aborted() && | |
| 4028 satb_mq_set.apply_closure_to_completed_buffer()) { | |
|
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4029 if (_cm->verbose_medium()) { |
|
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4030 gclog_or_tty->print_cr("[%u] processed an SATB buffer", _worker_id); |
|
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4031 } |
| 342 | 4032 statsOnly( ++_satb_buffers_processed ); |
| 4033 regular_clock_call(); | |
| 4034 } | |
| 4035 } | |
| 4036 | |
| 4037 _draining_satb_buffers = false; | |
| 4038 | |
|
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4039 assert(has_aborted() || |
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4040 concurrent() || |
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4041 satb_mq_set.completed_buffers_num() == 0, "invariant"); |
| 342 | 4042 |
|
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4043 if (G1CollectedHeap::use_parallel_gc_threads()) { |
|
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4044 satb_mq_set.set_par_closure(_worker_id, NULL); |
|
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4045 } else { |
| 342 | 4046 satb_mq_set.set_closure(NULL); |
|
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4047 } |
| 342 | 4048 |
| 4049 // again, this was a potentially expensive operation, decrease the | |
| 4050 // limits to get the regular clock call early | |
| 4051 decrease_limits(); | |
| 4052 } | |
| 4053 | |
| 4054 void CMTask::print_stats() { | |
|
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4055 gclog_or_tty->print_cr("Marking Stats, task = %u, calls = %d", |
|
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4056 _worker_id, _calls); |
| 342 | 4057 gclog_or_tty->print_cr(" Elapsed time = %1.2lfms, Termination time = %1.2lfms", |
| 4058 _elapsed_time_ms, _termination_time_ms); | |
| 4059 gclog_or_tty->print_cr(" Step Times (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 4060 _step_times_ms.num(), _step_times_ms.avg(), | |
| 4061 _step_times_ms.sd()); | |
| 4062 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 4063 _step_times_ms.maximum(), _step_times_ms.sum()); | |
| 4064 | |
| 4065 #if _MARKING_STATS_ | |
| 4066 gclog_or_tty->print_cr(" Clock Intervals (cum): num = %d, avg = %1.2lfms, sd = %1.2lfms", | |
| 4067 _all_clock_intervals_ms.num(), _all_clock_intervals_ms.avg(), | |
| 4068 _all_clock_intervals_ms.sd()); | |
| 4069 gclog_or_tty->print_cr(" max = %1.2lfms, total = %1.2lfms", | |
| 4070 _all_clock_intervals_ms.maximum(), | |
| 4071 _all_clock_intervals_ms.sum()); | |
| 4072 gclog_or_tty->print_cr(" Clock Causes (cum): scanning = %d, marking = %d", | |
| 4073 _clock_due_to_scanning, _clock_due_to_marking); | |
| 4074 gclog_or_tty->print_cr(" Objects: scanned = %d, found on the bitmap = %d", | |
| 4075 _objs_scanned, _objs_found_on_bitmap); | |
| 4076 gclog_or_tty->print_cr(" Local Queue: pushes = %d, pops = %d, max size = %d", | |
| 4077 _local_pushes, _local_pops, _local_max_size); | |
| 4078 gclog_or_tty->print_cr(" Global Stack: pushes = %d, pops = %d, max size = %d", | |
| 4079 _global_pushes, _global_pops, _global_max_size); | |
| 4080 gclog_or_tty->print_cr(" transfers to = %d, transfers from = %d", | |
| 4081 _global_transfers_to,_global_transfers_from); | |
|
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4082 gclog_or_tty->print_cr(" Regions: claimed = %d", _regions_claimed); |
| 342 | 4083 gclog_or_tty->print_cr(" SATB buffers: processed = %d", _satb_buffers_processed); |
| 4084 gclog_or_tty->print_cr(" Steals: attempts = %d, successes = %d", | |
| 4085 _steal_attempts, _steals); | |
| 4086 gclog_or_tty->print_cr(" Aborted: %d, due to", _aborted); | |
| 4087 gclog_or_tty->print_cr(" overflow: %d, global abort: %d, yield: %d", | |
| 4088 _aborted_overflow, _aborted_cm_aborted, _aborted_yield); | |
| 4089 gclog_or_tty->print_cr(" time out: %d, SATB: %d, termination: %d", | |
| 4090 _aborted_timed_out, _aborted_satb, _aborted_termination); | |
| 4091 #endif // _MARKING_STATS_ | |
| 4092 } | |
| 4093 | |
| 4094 /***************************************************************************** | |
| 4095 | |
|
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4096 The do_marking_step(time_target_ms, ...) method is the building |
|
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4097 block of the parallel marking framework. It can be called in parallel |
| 342 | 4098 with other invocations of do_marking_step() on different tasks |
| 4099 (but only one per task, obviously) and concurrently with the | |
| 4100 mutator threads, or during remark, hence it eliminates the need | |
| 4101 for two versions of the code. When called during remark, it will | |
| 4102 pick up from where the task left off during the concurrent marking | |
| 4103 phase. Interestingly, tasks are also claimable during evacuation | |
| 4104 pauses too, since do_marking_step() ensures that it aborts before | |
| 4105 it needs to yield. | |
| 4106 | |
|
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4107 The data structures that it uses to do marking work are the |
| 342 | 4108 following: |
| 4109 | |
| 4110 (1) Marking Bitmap. If there are gray objects that appear only | |
| 4111 on the bitmap (this happens either when dealing with an overflow | |
| 4112 or when the initial marking phase has simply marked the roots | |
| 4113 and didn't push them on the stack), then tasks claim heap | |
| 4114 regions whose bitmap they then scan to find gray objects. A | |
| 4115 global finger indicates where the end of the last claimed region | |
| 4116 is. A local finger indicates how far into the region a task has | |
| 4117 scanned. The two fingers are used to determine how to gray an | |
| 4118 object (i.e. whether simply marking it is OK, as it will be | |
| 4119 visited by a task in the future, or whether it needs to be also | |
| 4120 pushed on a stack). | |
| 4121 | |
| 4122 (2) Local Queue. The local queue of the task which is accessed | |
| 4123 reasonably efficiently by the task. Other tasks can steal from | |
| 4124 it when they run out of work. Throughout the marking phase, a | |
| 4125 task attempts to keep its local queue short but not totally | |
| 4126 empty, so that entries are available for stealing by other | |
| 4127 tasks. Only when there is no more work, a task will totally | |
| 4128 drain its local queue. | |
| 4129 | |
| 4130 (3) Global Mark Stack. This handles local queue overflow. During | |
| 4131 marking only sets of entries are moved between it and the local | |
| 4132 queues, as access to it requires a mutex and more fine-grain | |
| 4133 interaction with it which might cause contention. If it | |
| 4134 overflows, then the marking phase should restart and iterate | |
| 4135 over the bitmap to identify gray objects. Throughout the marking | |
| 4136 phase, tasks attempt to keep the global mark stack at a small | |
| 4137 length but not totally empty, so that entries are available for | |
| 4138 popping by other tasks. Only when there is no more work, tasks | |
| 4139 will totally drain the global mark stack. | |
| 4140 | |
|
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4141 (4) SATB Buffer Queue. This is where completed SATB buffers are |
| 342 | 4142 made available. Buffers are regularly removed from this queue |
| 4143 and scanned for roots, so that the queue doesn't get too | |
| 4144 long. During remark, all completed buffers are processed, as | |
| 4145 well as the filled in parts of any uncompleted buffers. | |
| 4146 | |
| 4147 The do_marking_step() method tries to abort when the time target | |
| 4148 has been reached. There are a few other cases when the | |
| 4149 do_marking_step() method also aborts: | |
| 4150 | |
| 4151 (1) When the marking phase has been aborted (after a Full GC). | |
| 4152 | |
|
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4153 (2) When a global overflow (on the global stack) has been |
|
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4154 triggered. Before the task aborts, it will actually sync up with |
|
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4155 the other tasks to ensure that all the marking data structures |
|
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4156 (local queues, stacks, fingers etc.) are re-initialized so that |
|
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4157 when do_marking_step() completes, the marking phase can |
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4158 immediately restart. |
| 342 | 4159 |
| 4160 (3) When enough completed SATB buffers are available. The | |
| 4161 do_marking_step() method only tries to drain SATB buffers right | |
| 4162 at the beginning. So, if enough buffers are available, the | |
| 4163 marking step aborts and the SATB buffers are processed at | |
| 4164 the beginning of the next invocation. | |
| 4165 | |
| 4166 (4) To yield. when we have to yield then we abort and yield | |
| 4167 right at the end of do_marking_step(). This saves us from a lot | |
| 4168 of hassle as, by yielding we might allow a Full GC. If this | |
| 4169 happens then objects will be compacted underneath our feet, the | |
| 4170 heap might shrink, etc. We save checking for this by just | |
| 4171 aborting and doing the yield right at the end. | |
| 4172 | |
| 4173 From the above it follows that the do_marking_step() method should | |
| 4174 be called in a loop (or, otherwise, regularly) until it completes. | |
| 4175 | |
| 4176 If a marking step completes without its has_aborted() flag being | |
| 4177 true, it means it has completed the current marking phase (and | |
| 4178 also all other marking tasks have done so and have all synced up). | |
| 4179 | |
| 4180 A method called regular_clock_call() is invoked "regularly" (in | |
| 4181 sub ms intervals) throughout marking. It is this clock method that | |
| 4182 checks all the abort conditions which were mentioned above and | |
| 4183 decides when the task should abort. A work-based scheme is used to | |
| 4184 trigger this clock method: when the number of object words the | |
| 4185 marking phase has scanned or the number of references the marking | |
| 4186 phase has visited reach a given limit. Additional invocations to | |
| 4187 the method clock have been planted in a few other strategic places | |
| 4188 too. The initial reason for the clock method was to avoid calling | |
| 4189 vtime too regularly, as it is quite expensive. So, once it was in | |
| 4190 place, it was natural to piggy-back all the other conditions on it | |
| 4191 too and not constantly check them throughout the code. | |
| 4192 | |
|
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4193 If do_termination is true then do_marking_step will enter its |
|
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4194 termination protocol. |
|
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4195 |
|
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4196 The value of is_serial must be true when do_marking_step is being |
|
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4197 called serially (i.e. by the VMThread) and do_marking_step should |
|
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4198 skip any synchronization in the termination and overflow code. |
|
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4199 Examples include the serial remark code and the serial reference |
|
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4200 processing closures. |
|
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4201 |
|
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4202 The value of is_serial must be false when do_marking_step is |
|
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4203 being called by any of the worker threads in a work gang. |
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4204 Examples include the concurrent marking code (CMMarkingTask), |
|
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4205 the MT remark code, and the MT reference processing closures. |
|
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4206 |
| 342 | 4207 *****************************************************************************/ |
| 4208 | |
|
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|
4209 void CMTask::do_marking_step(double time_target_ms, |
|
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4210 bool do_termination, |
|
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4211 bool is_serial) { |
|
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4212 assert(time_target_ms >= 1.0, "minimum granularity is 1ms"); |
|
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4213 assert(concurrent() == _cm->concurrent(), "they should be the same"); |
|
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4214 |
| 342 | 4215 G1CollectorPolicy* g1_policy = _g1h->g1_policy(); |
|
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4216 assert(_task_queues != NULL, "invariant"); |
|
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4217 assert(_task_queue != NULL, "invariant"); |
|
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4218 assert(_task_queues->queue(_worker_id) == _task_queue, "invariant"); |
|
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4219 |
|
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4220 assert(!_claimed, |
|
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4221 "only one thread should claim this task at any one time"); |
| 342 | 4222 |
| 4223 // OK, this doesn't safeguard again all possible scenarios, as it is | |
| 4224 // possible for two threads to set the _claimed flag at the same | |
| 4225 // time. But it is only for debugging purposes anyway and it will | |
| 4226 // catch most problems. | |
| 4227 _claimed = true; | |
| 4228 | |
| 4229 _start_time_ms = os::elapsedVTime() * 1000.0; | |
| 4230 statsOnly( _interval_start_time_ms = _start_time_ms ); | |
| 4231 | |
|
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|
4232 // If do_stealing is true then do_marking_step will attempt to |
|
fa08949fe0cb
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|
4233 // steal work from the other CMTasks. It only makes sense to |
|
fa08949fe0cb
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|
4234 // enable stealing when the termination protocol is enabled |
|
fa08949fe0cb
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|
4235 // and do_marking_step() is not being called serially. |
|
fa08949fe0cb
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|
4236 bool do_stealing = do_termination && !is_serial; |
|
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|
4237 |
| 342 | 4238 double diff_prediction_ms = |
| 4239 g1_policy->get_new_prediction(&_marking_step_diffs_ms); | |
| 4240 _time_target_ms = time_target_ms - diff_prediction_ms; | |
| 4241 | |
| 4242 // set up the variables that are used in the work-based scheme to | |
| 4243 // call the regular clock method | |
| 4244 _words_scanned = 0; | |
| 4245 _refs_reached = 0; | |
| 4246 recalculate_limits(); | |
| 4247 | |
| 4248 // clear all flags | |
| 4249 clear_has_aborted(); | |
|
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|
4250 _has_timed_out = false; |
| 342 | 4251 _draining_satb_buffers = false; |
| 4252 | |
| 4253 ++_calls; | |
| 4254 | |
|
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|
4255 if (_cm->verbose_low()) { |
|
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|
4256 gclog_or_tty->print_cr("[%u] >>>>>>>>>> START, call = %d, " |
| 342 | 4257 "target = %1.2lfms >>>>>>>>>>", |
|
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|
4258 _worker_id, _calls, _time_target_ms); |
|
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|
4259 } |
| 342 | 4260 |
| 4261 // Set up the bitmap and oop closures. Anything that uses them is | |
| 4262 // eventually called from this method, so it is OK to allocate these | |
| 4263 // statically. | |
| 4264 CMBitMapClosure bitmap_closure(this, _cm, _nextMarkBitMap); | |
| 3771 | 4265 G1CMOopClosure cm_oop_closure(_g1h, _cm, this); |
| 4266 set_cm_oop_closure(&cm_oop_closure); | |
| 342 | 4267 |
| 4268 if (_cm->has_overflown()) { | |
|
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|
4269 // This can happen if the mark stack overflows during a GC pause |
|
2a0172480595
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|
4270 // and this task, after a yield point, restarts. We have to abort |
|
2a0172480595
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|
4271 // as we need to get into the overflow protocol which happens |
|
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|
4272 // right at the end of this task. |
| 342 | 4273 set_has_aborted(); |
| 4274 } | |
| 4275 | |
| 4276 // First drain any available SATB buffers. After this, we will not | |
| 4277 // look at SATB buffers before the next invocation of this method. | |
| 4278 // If enough completed SATB buffers are queued up, the regular clock | |
| 4279 // will abort this task so that it restarts. | |
| 4280 drain_satb_buffers(); | |
| 4281 // ...then partially drain the local queue and the global stack | |
| 4282 drain_local_queue(true); | |
| 4283 drain_global_stack(true); | |
| 4284 | |
| 4285 do { | |
| 4286 if (!has_aborted() && _curr_region != NULL) { | |
| 4287 // This means that we're already holding on to a region. | |
|
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|
4288 assert(_finger != NULL, "if region is not NULL, then the finger " |
|
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|
4289 "should not be NULL either"); |
| 342 | 4290 |
| 4291 // We might have restarted this task after an evacuation pause | |
| 4292 // which might have evacuated the region we're holding on to | |
| 4293 // underneath our feet. Let's read its limit again to make sure | |
| 4294 // that we do not iterate over a region of the heap that | |
| 4295 // contains garbage (update_region_limit() will also move | |
| 4296 // _finger to the start of the region if it is found empty). | |
| 4297 update_region_limit(); | |
| 4298 // We will start from _finger not from the start of the region, | |
| 4299 // as we might be restarting this task after aborting half-way | |
| 4300 // through scanning this region. In this case, _finger points to | |
| 4301 // the address where we last found a marked object. If this is a | |
| 4302 // fresh region, _finger points to start(). | |
| 4303 MemRegion mr = MemRegion(_finger, _region_limit); | |
| 4304 | |
|
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|
4305 if (_cm->verbose_low()) { |
|
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|
4306 gclog_or_tty->print_cr("[%u] we're scanning part " |
| 342 | 4307 "["PTR_FORMAT", "PTR_FORMAT") " |
|
8039
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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 "of region "HR_FORMAT, |
|
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|
4309 _worker_id, p2i(_finger), p2i(_region_limit), |
|
8039
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|
4310 HR_FORMAT_PARAMS(_curr_region)); |
|
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|
4311 } |
| 342 | 4312 |
|
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|
4313 assert(!_curr_region->isHumongous() || mr.start() == _curr_region->bottom(), |
|
5e401ef52ec0
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|
4314 "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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|
4315 |
|
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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|
4316 // Some special cases: |
|
5e401ef52ec0
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|
4317 // 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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|
4318 // If the current region is humongous then we only need to check |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4319 // the bitmap for the bit associated with the start of the object, |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4320 // scan the object if it's live, and give up the region. |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4321 // 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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|
4322 // that is left. |
|
8034
bce1ac447f6b
7052429: G1: Avoid unnecessary scanning of humongous regions during concurrent marking
johnc
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8014
diff
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|
4323 // 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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|
4324 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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|
4325 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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|
4326 regular_clock_call(); |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4327 } else if (_curr_region->isHumongous() && mr.start() == _curr_region->bottom()) { |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
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|
4328 if (_nextMarkBitMap->isMarked(mr.start())) { |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4329 // The object is marked - apply the closure |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4330 BitMap::idx_t offset = _nextMarkBitMap->heapWordToOffset(mr.start()); |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4331 bitmap_closure.do_bit(offset); |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4332 } |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4333 // 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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|
4334 // we can (and should) give up the current region. |
|
5e401ef52ec0
8007772: G1: assert(!hr->isHumongous() || mr.start() == hr->bottom()) failed: the start of HeapRegion and MemRegion should be consistent for humongous regions
johnc
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|
4335 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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|
4336 regular_clock_call(); |
|
5e401ef52ec0
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|
4337 } else if (_nextMarkBitMap->iterate(&bitmap_closure, mr)) { |
| 342 | 4338 giveup_current_region(); |
| 4339 regular_clock_call(); | |
| 4340 } else { | |
|
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|
4341 assert(has_aborted(), "currently the only way to do so"); |
| 342 | 4342 // The only way to abort the bitmap iteration is to return |
| 4343 // false from the do_bit() method. However, inside the | |
| 4344 // do_bit() method we move the _finger to point to the | |
| 4345 // object currently being looked at. So, if we bail out, we | |
| 4346 // have definitely set _finger to something non-null. | |
|
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|
4347 assert(_finger != NULL, "invariant"); |
| 342 | 4348 |
| 4349 // Region iteration was actually aborted. So now _finger | |
| 4350 // points to the address of the object we last scanned. If we | |
| 4351 // leave it there, when we restart this task, we will rescan | |
| 4352 // the object. It is easy to avoid this. We move the finger by | |
| 4353 // enough to point to the next possible object header (the | |
| 4354 // bitmap knows by how much we need to move it as it knows its | |
| 4355 // granularity). | |
|
1314
3f0549ed0c98
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apetrusenko
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diff
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|
4356 assert(_finger < _region_limit, "invariant"); |
|
8733
9def4075da6d
8008079: G1: Add nextObject routine to CMBitMapRO and replace nextWord
tamao
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|
4357 HeapWord* new_finger = _nextMarkBitMap->nextObject(_finger); |
|
1314
3f0549ed0c98
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apetrusenko
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diff
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|
4358 // 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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|
4359 if (new_finger >= _region_limit) { |
|
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|
4360 giveup_current_region(); |
|
1314
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|
4361 } else { |
|
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|
4362 move_finger_to(new_finger); |
|
1314
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|
4363 } |
| 342 | 4364 } |
| 4365 } | |
| 4366 // At this point we have either completed iterating over the | |
| 4367 // region we were holding on to, or we have aborted. | |
| 4368 | |
| 4369 // We then partially drain the local queue and the global stack. | |
| 4370 // (Do we really need this?) | |
| 4371 drain_local_queue(true); | |
| 4372 drain_global_stack(true); | |
| 4373 | |
| 4374 // Read the note on the claim_region() method on why it might | |
| 4375 // return NULL with potentially more regions available for | |
| 4376 // claiming and why we have to check out_of_regions() to determine | |
| 4377 // whether we're done or not. | |
| 4378 while (!has_aborted() && _curr_region == NULL && !_cm->out_of_regions()) { | |
| 4379 // We are going to try to claim a new region. We should have | |
| 4380 // given up on the previous one. | |
|
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|
4381 // Separated the asserts so that we know which one fires. |
|
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|
4382 assert(_curr_region == NULL, "invariant"); |
|
11d4857fe5e1
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|
4383 assert(_finger == NULL, "invariant"); |
|
11d4857fe5e1
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|
4384 assert(_region_limit == NULL, "invariant"); |
|
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|
4385 if (_cm->verbose_low()) { |
|
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|
4386 gclog_or_tty->print_cr("[%u] trying to claim a new region", _worker_id); |
|
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|
4387 } |
|
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|
4388 HeapRegion* claimed_region = _cm->claim_region(_worker_id); |
| 342 | 4389 if (claimed_region != NULL) { |
| 4390 // Yes, we managed to claim one | |
| 4391 statsOnly( ++_regions_claimed ); | |
| 4392 | |
|
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|
4393 if (_cm->verbose_low()) { |
|
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|
4394 gclog_or_tty->print_cr("[%u] we successfully claimed " |
| 342 | 4395 "region "PTR_FORMAT, |
|
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|
4396 _worker_id, p2i(claimed_region)); |
|
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|
4397 } |
| 342 | 4398 |
| 4399 setup_for_region(claimed_region); | |
|
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|
4400 assert(_curr_region == claimed_region, "invariant"); |
| 342 | 4401 } |
| 4402 // It is important to call the regular clock here. It might take | |
| 4403 // a while to claim a region if, for example, we hit a large | |
| 4404 // block of empty regions. So we need to call the regular clock | |
| 4405 // method once round the loop to make sure it's called | |
| 4406 // frequently enough. | |
| 4407 regular_clock_call(); | |
| 4408 } | |
| 4409 | |
| 4410 if (!has_aborted() && _curr_region == NULL) { | |
|
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|
4411 assert(_cm->out_of_regions(), |
|
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|
4412 "at this point we should be out of regions"); |
| 342 | 4413 } |
| 4414 } while ( _curr_region != NULL && !has_aborted()); | |
| 4415 | |
| 4416 if (!has_aborted()) { | |
| 4417 // We cannot check whether the global stack is empty, since other | |
|
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|
4418 // tasks might be pushing objects to it concurrently. |
|
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|
4419 assert(_cm->out_of_regions(), |
|
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1022
diff
changeset
|
4420 "at this point we should be out of regions"); |
| 342 | 4421 |
|
3776
23d434c6290d
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changeset
|
4422 if (_cm->verbose_low()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4423 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
|
4424 } |
| 342 | 4425 |
| 4426 // Try to reduce the number of available SATB buffers so that | |
| 4427 // remark has less work to do. | |
| 4428 drain_satb_buffers(); | |
| 4429 } | |
| 4430 | |
| 4431 // Since we've done everything else, we can now totally drain the | |
| 4432 // local queue and global stack. | |
| 4433 drain_local_queue(false); | |
| 4434 drain_global_stack(false); | |
| 4435 | |
| 4436 // 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
changeset
|
4437 if (do_stealing && !has_aborted()) { |
| 342 | 4438 // We have not aborted. This means that we have finished all that |
| 4439 // we could. Let's try to do some stealing... | |
| 4440 | |
| 4441 // 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
|
4442 // tasks might be pushing objects to it concurrently. |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4443 assert(_cm->out_of_regions() && _task_queue->size() == 0, |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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1022
diff
changeset
|
4444 "only way to reach here"); |
| 342 | 4445 |
|
3776
23d434c6290d
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diff
changeset
|
4446 if (_cm->verbose_low()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4447 gclog_or_tty->print_cr("[%u] starting to steal", _worker_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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diff
changeset
|
4448 } |
| 342 | 4449 |
| 4450 while (!has_aborted()) { | |
| 4451 oop obj; | |
| 4452 statsOnly( ++_steal_attempts ); | |
| 4453 | |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4454 if (_cm->try_stealing(_worker_id, &_hash_seed, obj)) { |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
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diff
changeset
|
4455 if (_cm->verbose_medium()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4456 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
|
4457 _worker_id, p2i((void*) obj)); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
4458 } |
| 342 | 4459 |
| 4460 statsOnly( ++_steals ); | |
| 4461 | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4462 assert(_nextMarkBitMap->isMarked((HeapWord*) obj), |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4463 "any stolen object should be marked"); |
| 342 | 4464 scan_object(obj); |
| 4465 | |
| 4466 // And since we're towards the end, let's totally drain the | |
| 4467 // local queue and global stack. | |
| 4468 drain_local_queue(false); | |
| 4469 drain_global_stack(false); | |
| 4470 } else { | |
| 4471 break; | |
| 4472 } | |
| 4473 } | |
| 4474 } | |
| 4475 | |
|
3316
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4476 // If 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
|
4477 // 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
|
4478 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
|
4479 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
|
4480 _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
|
4481 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
|
4482 } |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
changeset
|
4483 } |
|
cd8e33b2a8ad
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
2436
diff
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|
4484 |
| 342 | 4485 // We still haven't aborted. Now, let's try to get into the |
| 4486 // termination protocol. | |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
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parents:
2152
diff
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|
4487 if (do_termination && !has_aborted()) { |
| 342 | 4488 // 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
|
4489 // tasks might be concurrently pushing objects on it. |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4490 // Separated the asserts so that we know which one fires. |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4491 assert(_cm->out_of_regions(), "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4492 assert(_task_queue->size() == 0, "only way to reach here"); |
| 342 | 4493 |
|
3776
23d434c6290d
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diff
changeset
|
4494 if (_cm->verbose_low()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4495 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
|
4496 } |
| 342 | 4497 |
| 4498 _termination_start_time_ms = os::elapsedVTime() * 1000.0; | |
|
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4499 |
| 342 | 4500 // The CMTask class also extends the TerminatorTerminator class, |
| 4501 // hence its should_exit_termination() method will also decide | |
| 4502 // whether to exit the termination protocol or not. | |
|
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4503 bool finished = (is_serial || |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4504 _cm->terminator()->offer_termination(this)); |
| 342 | 4505 double termination_end_time_ms = os::elapsedVTime() * 1000.0; |
| 4506 _termination_time_ms += | |
| 4507 termination_end_time_ms - _termination_start_time_ms; | |
| 4508 | |
| 4509 if (finished) { | |
| 4510 // We're all done. | |
| 4511 | |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
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6812
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changeset
|
4512 if (_worker_id == 0) { |
| 342 | 4513 // let's allow task 0 to do this |
| 4514 if (concurrent()) { | |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
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1022
diff
changeset
|
4515 assert(_cm->concurrent_marking_in_progress(), "invariant"); |
| 342 | 4516 // we need to set this to false before the next |
| 4517 // safepoint. This way we ensure that the marking phase | |
| 4518 // doesn't observe any more heap expansions. | |
| 4519 _cm->clear_concurrent_marking_in_progress(); | |
| 4520 } | |
| 4521 } | |
| 4522 | |
| 4523 // 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
|
4524 // all other tasks have finished. We separated the guarantees so |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4525 // 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
|
4526 // which one. |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4527 guarantee(_cm->out_of_regions(), "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4528 guarantee(_cm->mark_stack_empty(), "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4529 guarantee(_task_queue->size() == 0, "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4530 guarantee(!_cm->has_overflown(), "only way to reach here"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4531 guarantee(!_cm->mark_stack_overflow(), "only way to reach here"); |
| 342 | 4532 |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
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3772
diff
changeset
|
4533 if (_cm->verbose_low()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4534 gclog_or_tty->print_cr("[%u] all tasks terminated", _worker_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4535 } |
| 342 | 4536 } else { |
| 4537 // Apparently there's more work to do. Let's abort this task. It | |
| 4538 // will restart it and we can hopefully find more things to do. | |
| 4539 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4540 if (_cm->verbose_low()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4541 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
|
4542 _worker_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
4543 } |
| 342 | 4544 |
| 4545 set_has_aborted(); | |
| 4546 statsOnly( ++_aborted_termination ); | |
| 4547 } | |
| 4548 } | |
| 4549 | |
| 4550 // Mainly for debugging purposes to make sure that a pointer to the | |
| 4551 // closure which was statically allocated in this frame doesn't | |
| 4552 // escape it by accident. | |
| 3771 | 4553 set_cm_oop_closure(NULL); |
| 342 | 4554 double end_time_ms = os::elapsedVTime() * 1000.0; |
| 4555 double elapsed_time_ms = end_time_ms - _start_time_ms; | |
| 4556 // Update the step history. | |
| 4557 _step_times_ms.add(elapsed_time_ms); | |
| 4558 | |
| 4559 if (has_aborted()) { | |
| 4560 // The task was aborted for some reason. | |
| 4561 | |
| 4562 statsOnly( ++_aborted ); | |
| 4563 | |
|
2174
234761c55641
6608385: G1: need to support parallel reference processing
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2152
diff
changeset
|
4564 if (_has_timed_out) { |
| 342 | 4565 double diff_ms = elapsed_time_ms - _time_target_ms; |
| 4566 // Keep statistics of how well we did with respect to hitting | |
| 4567 // our target only if we actually timed out (if we aborted for | |
| 4568 // other reasons, then the results might get skewed). | |
| 4569 _marking_step_diffs_ms.add(diff_ms); | |
| 4570 } | |
| 4571 | |
| 4572 if (_cm->has_overflown()) { | |
| 4573 // This is the interesting one. We aborted because a global | |
| 4574 // overflow was raised. This means we have to restart the | |
| 4575 // marking phase and start iterating over regions. However, in | |
| 4576 // order to do this we have to make sure that all tasks stop | |
| 4577 // what they are doing and re-initialise in a safe manner. We | |
| 4578 // will achieve this with the use of two barrier sync points. | |
| 4579 | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
4580 if (_cm->verbose_low()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4581 gclog_or_tty->print_cr("[%u] detected overflow", _worker_id); |
|
3776
23d434c6290d
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tonyp
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3772
diff
changeset
|
4582 } |
| 342 | 4583 |
|
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4584 if (!is_serial) { |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4585 // 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
|
4586 // from a parallel context |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4587 _cm->enter_first_sync_barrier(_worker_id); |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4588 |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4589 // 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
|
4590 // stopped doing marking work. So, it's now safe to |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4591 // 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
|
4592 // task 0 will clear the global data structures. |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4593 } |
| 342 | 4594 |
| 4595 statsOnly( ++_aborted_overflow ); | |
| 4596 | |
| 4597 // We clear the local state of this task... | |
| 4598 clear_region_fields(); | |
| 4599 | |
|
8787
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4600 if (!is_serial) { |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4601 // ...and enter the second barrier. |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4602 _cm->enter_second_sync_barrier(_worker_id); |
|
fa08949fe0cb
8009536: G1: Apache Lucene hang during reference processing
johnc
parents:
8744
diff
changeset
|
4603 } |
|
8788
e864cc14ca75
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
8787
diff
changeset
|
4604 // 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
|
4605 // marking, everything has been re-initialized and we're |
| 342 | 4606 // ready to restart. |
| 4607 } | |
| 4608 | |
| 4609 if (_cm->verbose_low()) { | |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4610 gclog_or_tty->print_cr("[%u] <<<<<<<<<< ABORTING, target = %1.2lfms, " |
| 342 | 4611 "elapsed = %1.2lfms <<<<<<<<<<", |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4612 _worker_id, _time_target_ms, elapsed_time_ms); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4613 if (_cm->has_aborted()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4614 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
|
4615 _worker_id); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
4616 } |
| 342 | 4617 } |
| 4618 } else { | |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
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3772
diff
changeset
|
4619 if (_cm->verbose_low()) { |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4620 gclog_or_tty->print_cr("[%u] <<<<<<<<<< FINISHED, target = %1.2lfms, " |
| 342 | 4621 "elapsed = %1.2lfms <<<<<<<<<<", |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4622 _worker_id, _time_target_ms, elapsed_time_ms); |
|
3776
23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
3772
diff
changeset
|
4623 } |
| 342 | 4624 } |
| 4625 | |
| 4626 _claimed = false; | |
| 4627 } | |
| 4628 | |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4629 CMTask::CMTask(uint worker_id, |
| 342 | 4630 ConcurrentMark* cm, |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4631 size_t* marked_bytes, |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4632 BitMap* card_bm, |
| 342 | 4633 CMTaskQueue* task_queue, |
| 4634 CMTaskQueueSet* task_queues) | |
| 4635 : _g1h(G1CollectedHeap::heap()), | |
|
6862
8a5ea0a9ccc4
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
6812
diff
changeset
|
4636 _worker_id(worker_id), _cm(cm), |
| 342 | 4637 _claimed(false), |
| 4638 _nextMarkBitMap(NULL), _hash_seed(17), | |
| 4639 _task_queue(task_queue), | |
| 4640 _task_queues(task_queues), | |
| 3771 | 4641 _cm_oop_closure(NULL), |
|
4836
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4642 _marked_bytes_array(marked_bytes), |
|
d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
4830
diff
changeset
|
4643 _card_bm(card_bm) { |
|
1023
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4644 guarantee(task_queue != NULL, "invariant"); |
|
11d4857fe5e1
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
1022
diff
changeset
|
4645 guarantee(task_queues != NULL, "invariant"); |
| 342 | 4646 |
| 4647 statsOnly( _clock_due_to_scanning = 0; | |
| 4648 _clock_due_to_marking = 0 ); | |
| 4649 | |
| 4650 _marking_step_diffs_ms.add(0.5); | |
| 4651 } | |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4652 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4653 // 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
|
4654 // 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
|
4655 // 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
|
4656 // 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
|
4657 // 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
|
4658 // 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
|
4659 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4660 // 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
|
4661 // 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
|
4662 #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
|
4663 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4664 #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
|
4665 #ifdef _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4666 #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
|
4667 #else // _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4668 #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
|
4669 #endif // _LP64 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4670 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4671 // 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
|
4672 #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
|
4673 #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
|
4674 #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
|
4675 #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
|
4676 #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
|
4677 #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
|
4678 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4679 // 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
|
4680 #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
|
4681 #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
|
4682 #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
|
4683 #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
|
4684 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4685 G1PrintRegionLivenessInfoClosure:: |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4686 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
|
4687 : _out(out), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4688 _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
|
4689 _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
|
4690 _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
|
4691 _hum_prev_live_bytes(0), _hum_next_live_bytes(0), |
| 12080 | 4692 _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
|
4693 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
|
4694 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
|
4695 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
|
4696 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4697 // 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
|
4698 _out->cr(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4699 _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
|
4700 _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
|
4701 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
|
4702 G1PPRL_SUM_BYTE_FORMAT("region-size"), |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
4703 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
|
4704 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
|
4705 _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
|
4706 _out->print_cr(G1PPRL_LINE_PREFIX |
|
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4707 G1PPRL_TYPE_H_FORMAT |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4708 G1PPRL_ADDR_BASE_H_FORMAT |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4709 G1PPRL_BYTE_H_FORMAT |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4710 G1PPRL_BYTE_H_FORMAT |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4711 G1PPRL_BYTE_H_FORMAT |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4712 G1PPRL_DOUBLE_H_FORMAT |
| 12080 | 4713 G1PPRL_BYTE_H_FORMAT |
|
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4714 G1PPRL_BYTE_H_FORMAT, |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4715 "type", "address-range", |
| 12080 | 4716 "used", "prev-live", "next-live", "gc-eff", |
| 4717 "remset", "code-roots"); | |
|
3977
5cc33133bc6d
7092245: G1: Wrong format specifier in G1PrintRegionLivenessInfo header output
johnc
parents:
3975
diff
changeset
|
4718 _out->print_cr(G1PPRL_LINE_PREFIX |
|
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4719 G1PPRL_TYPE_H_FORMAT |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4720 G1PPRL_ADDR_BASE_H_FORMAT |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4721 G1PPRL_BYTE_H_FORMAT |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4722 G1PPRL_BYTE_H_FORMAT |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4723 G1PPRL_BYTE_H_FORMAT |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4724 G1PPRL_DOUBLE_H_FORMAT |
| 12080 | 4725 G1PPRL_BYTE_H_FORMAT |
|
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4726 G1PPRL_BYTE_H_FORMAT, |
|
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4727 "", "", |
| 12080 | 4728 "(bytes)", "(bytes)", "(bytes)", "(bytes/ms)", |
| 4729 "(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
|
4730 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4731 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4732 // 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
|
4733 // 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
|
4734 // series (either the region size, or what's left if the _hum_* field |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4735 // 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
|
4736 size_t G1PrintRegionLivenessInfoClosure::get_hum_bytes(size_t* hum_bytes) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4737 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
|
4738 // 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
|
4739 // 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
|
4740 if (*hum_bytes > 0) { |
|
3986
65a8ff39a6da
7095194: G1: HeapRegion::GrainBytes, GrainWords, and CardsPerRegion should be size_t
johnc
parents:
3979
diff
changeset
|
4741 bytes = MIN2(HeapRegion::GrainBytes, *hum_bytes); |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4742 *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
|
4743 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4744 return bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4745 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4746 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4747 // 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
|
4748 // 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
|
4749 // 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
|
4750 // 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
|
4751 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
|
4752 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
|
4753 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
|
4754 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
|
4755 assert(_hum_used_bytes > 0 && _hum_capacity_bytes > 0, "pre-condition"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4756 *used_bytes = get_hum_bytes(&_hum_used_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
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diff
changeset
|
4757 *capacity_bytes = get_hum_bytes(&_hum_capacity_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4758 *prev_live_bytes = get_hum_bytes(&_hum_prev_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
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diff
changeset
|
4759 *next_live_bytes = get_hum_bytes(&_hum_next_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
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parents:
2369
diff
changeset
|
4760 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4761 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4762 bool G1PrintRegionLivenessInfoClosure::doHeapRegion(HeapRegion* r) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4763 const char* type = ""; |
|
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
|
4764 HeapWord* bottom = r->bottom(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4765 HeapWord* end = r->end(); |
|
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
|
4766 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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parents:
2369
diff
changeset
|
4767 size_t used_bytes = r->used(); |
|
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
|
4768 size_t prev_live_bytes = r->live_bytes(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4769 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
tonyp
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diff
changeset
|
4770 double gc_eff = r->gc_efficiency(); |
|
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4771 size_t remset_bytes = r->rem_set()->mem_size(); |
| 12080 | 4772 size_t strong_code_roots_bytes = r->rem_set()->strong_code_roots_mem_size(); |
| 4773 | |
|
2435
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
|
4774 if (r->used() == 0) { |
|
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
|
4775 type = "FREE"; |
|
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
|
4776 } else if (r->is_survivor()) { |
|
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
|
4777 type = "SURV"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4778 } else if (r->is_young()) { |
|
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
|
4779 type = "EDEN"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4780 } else if (r->startsHumongous()) { |
|
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
|
4781 type = "HUMS"; |
|
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
|
4782 |
|
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
|
4783 assert(_hum_used_bytes == 0 && _hum_capacity_bytes == 0 && |
|
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
|
4784 _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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parents:
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diff
changeset
|
4785 "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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parents:
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diff
changeset
|
4786 // Set up the _hum_* fields. |
|
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
|
4787 _hum_capacity_bytes = capacity_bytes; |
|
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
|
4788 _hum_used_bytes = used_bytes; |
|
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
|
4789 _hum_prev_live_bytes = prev_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
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diff
changeset
|
4790 _hum_next_live_bytes = next_live_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
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diff
changeset
|
4791 get_hum_bytes(&used_bytes, &capacity_bytes, |
|
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
|
4792 &prev_live_bytes, &next_live_bytes); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
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diff
changeset
|
4793 end = bottom + HeapRegion::GrainWords; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4794 } else if (r->continuesHumongous()) { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4795 type = "HUMC"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4796 get_hum_bytes(&used_bytes, &capacity_bytes, |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4797 &prev_live_bytes, &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
|
4798 assert(end == bottom + HeapRegion::GrainWords, "invariant"); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4799 } else { |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4800 type = "OLD"; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4801 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4802 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4803 _total_used_bytes += used_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4804 _total_capacity_bytes += capacity_bytes; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4805 _total_prev_live_bytes += 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
|
4806 _total_next_live_bytes += next_live_bytes; |
|
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4807 _total_remset_bytes += remset_bytes; |
| 12080 | 4808 _total_strong_code_roots_bytes += strong_code_roots_bytes; |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4809 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4810 // Print a line for this particular region. |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4811 _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
|
4812 G1PPRL_TYPE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4813 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
|
4814 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4815 G1PPRL_BYTE_FORMAT |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4816 G1PPRL_BYTE_FORMAT |
|
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4817 G1PPRL_DOUBLE_FORMAT |
| 12080 | 4818 G1PPRL_BYTE_FORMAT |
|
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4819 G1PPRL_BYTE_FORMAT, |
|
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17844
diff
changeset
|
4820 type, p2i(bottom), p2i(end), |
| 12080 | 4821 used_bytes, prev_live_bytes, next_live_bytes, gc_eff, |
| 4822 remset_bytes, strong_code_roots_bytes); | |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4823 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4824 return false; |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4825 } |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4826 |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4827 G1PrintRegionLivenessInfoClosure::~G1PrintRegionLivenessInfoClosure() { |
|
10290
05a17f270c7e
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
10186
diff
changeset
|
4828 // 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
|
4829 _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
tonyp
parents:
2369
diff
changeset
|
4830 // Print the footer 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
|
4831 _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
|
4832 _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
|
4833 " SUMMARY" |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4834 G1PPRL_SUM_MB_FORMAT("capacity") |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4835 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
|
4836 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
|
4837 G1PPRL_SUM_MB_PERC_FORMAT("next-live") |
| 12080 | 4838 G1PPRL_SUM_MB_FORMAT("remset") |
| 4839 G1PPRL_SUM_MB_FORMAT("code-roots"), | |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4840 bytes_to_mb(_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
|
4841 bytes_to_mb(_total_used_bytes), |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4842 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
|
4843 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
|
4844 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
|
4845 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
|
4846 perc(_total_next_live_bytes, _total_capacity_bytes), |
| 12080 | 4847 bytes_to_mb(_total_remset_bytes), |
| 4848 bytes_to_mb(_total_strong_code_roots_bytes)); | |
|
2435
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4849 _out->cr(); |
|
371bbc844bf1
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
2369
diff
changeset
|
4850 } |