Mercurial > hg > truffle
annotate src/share/vm/memory/genMarkSweep.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | d2a62e0f25eb |
| children | 8966c2d65d96 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/javaClasses.hpp" | |
| 27 #include "classfile/symbolTable.hpp" | |
| 28 #include "classfile/systemDictionary.hpp" | |
| 29 #include "classfile/vmSymbols.hpp" | |
| 30 #include "code/codeCache.hpp" | |
| 31 #include "code/icBuffer.hpp" | |
| 32 #include "gc_interface/collectedHeap.inline.hpp" | |
| 33 #include "memory/genCollectedHeap.hpp" | |
| 34 #include "memory/genMarkSweep.hpp" | |
| 35 #include "memory/genOopClosures.inline.hpp" | |
| 36 #include "memory/generation.inline.hpp" | |
| 37 #include "memory/modRefBarrierSet.hpp" | |
| 38 #include "memory/referencePolicy.hpp" | |
| 39 #include "memory/space.hpp" | |
| 40 #include "oops/instanceRefKlass.hpp" | |
| 41 #include "oops/oop.inline.hpp" | |
| 42 #include "prims/jvmtiExport.hpp" | |
| 43 #include "runtime/fprofiler.hpp" | |
| 44 #include "runtime/handles.inline.hpp" | |
| 45 #include "runtime/synchronizer.hpp" | |
| 46 #include "runtime/vmThread.hpp" | |
| 47 #include "utilities/copy.hpp" | |
| 48 #include "utilities/events.hpp" | |
| 49 #ifdef TARGET_OS_FAMILY_linux | |
| 50 # include "thread_linux.inline.hpp" | |
| 51 #endif | |
| 52 #ifdef TARGET_OS_FAMILY_solaris | |
| 53 # include "thread_solaris.inline.hpp" | |
| 54 #endif | |
| 55 #ifdef TARGET_OS_FAMILY_windows | |
| 56 # include "thread_windows.inline.hpp" | |
| 57 #endif | |
| 3960 | 58 #ifdef TARGET_OS_FAMILY_bsd |
| 59 # include "thread_bsd.inline.hpp" | |
| 60 #endif | |
| 0 | 61 |
| 62 void GenMarkSweep::invoke_at_safepoint(int level, ReferenceProcessor* rp, | |
| 63 bool clear_all_softrefs) { | |
| 64 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
| 65 | |
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66 GenCollectedHeap* gch = GenCollectedHeap::heap(); |
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67 #ifdef ASSERT |
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68 if (gch->collector_policy()->should_clear_all_soft_refs()) { |
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69 assert(clear_all_softrefs, "Policy should have been checked earlier"); |
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70 } |
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71 #endif |
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72 |
| 0 | 73 // hook up weak ref data so it can be used during Mark-Sweep |
| 74 assert(ref_processor() == NULL, "no stomping"); | |
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75 assert(rp != NULL, "should be non-NULL"); |
| 0 | 76 _ref_processor = rp; |
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77 rp->setup_policy(clear_all_softrefs); |
| 0 | 78 |
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79 TraceTime t1(GCCauseString("Full GC", gch->gc_cause()), PrintGC && !PrintGCDetails, true, gclog_or_tty); |
| 0 | 80 |
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81 // When collecting the permanent generation Method*s may be moving, |
| 0 | 82 // so we either have to flush all bcp data or convert it into bci. |
| 83 CodeCache::gc_prologue(); | |
| 84 Threads::gc_prologue(); | |
| 85 | |
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86 // Increment the invocation count |
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87 _total_invocations++; |
| 0 | 88 |
| 89 // Capture heap size before collection for printing. | |
| 90 size_t gch_prev_used = gch->used(); | |
| 91 | |
| 92 // Some of the card table updates below assume that the perm gen is | |
| 93 // also being collected. | |
| 94 assert(level == gch->n_gens() - 1, | |
| 95 "All generations are being collected, ergo perm gen too."); | |
| 96 | |
| 97 // Capture used regions for each generation that will be | |
| 98 // subject to collection, so that card table adjustments can | |
| 99 // be made intelligently (see clear / invalidate further below). | |
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100 gch->save_used_regions(level); |
| 0 | 101 |
| 102 allocate_stacks(); | |
| 103 | |
| 104 mark_sweep_phase1(level, clear_all_softrefs); | |
| 105 | |
| 106 mark_sweep_phase2(); | |
| 107 | |
| 108 // Don't add any more derived pointers during phase3 | |
| 109 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
| 110 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
| 111 | |
| 112 mark_sweep_phase3(level); | |
| 113 | |
| 114 VALIDATE_MARK_SWEEP_ONLY( | |
| 115 if (ValidateMarkSweep) { | |
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116 guarantee(_root_refs_stack->length() == 0, "should be empty by now"); |
| 0 | 117 } |
| 118 ) | |
| 119 | |
| 120 mark_sweep_phase4(); | |
| 121 | |
| 122 VALIDATE_MARK_SWEEP_ONLY( | |
| 123 if (ValidateMarkSweep) { | |
| 124 guarantee(_live_oops->length() == _live_oops_moved_to->length(), | |
| 125 "should be the same size"); | |
| 126 } | |
| 127 ) | |
| 128 | |
| 129 restore_marks(); | |
| 130 | |
| 131 // Set saved marks for allocation profiler (and other things? -- dld) | |
| 132 // (Should this be in general part?) | |
| 133 gch->save_marks(); | |
| 134 | |
| 135 deallocate_stacks(); | |
| 136 | |
| 137 // If compaction completely evacuated all generations younger than this | |
| 138 // one, then we can clear the card table. Otherwise, we must invalidate | |
| 139 // it (consider all cards dirty). In the future, we might consider doing | |
| 140 // compaction within generations only, and doing card-table sliding. | |
| 141 bool all_empty = true; | |
| 142 for (int i = 0; all_empty && i < level; i++) { | |
| 143 Generation* g = gch->get_gen(i); | |
| 144 all_empty = all_empty && gch->get_gen(i)->used() == 0; | |
| 145 } | |
| 146 GenRemSet* rs = gch->rem_set(); | |
| 147 // Clear/invalidate below make use of the "prev_used_regions" saved earlier. | |
| 148 if (all_empty) { | |
| 149 // We've evacuated all generations below us. | |
| 150 Generation* g = gch->get_gen(level); | |
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151 rs->clear_into_younger(g); |
| 0 | 152 } else { |
| 153 // Invalidate the cards corresponding to the currently used | |
| 154 // region and clear those corresponding to the evacuated region | |
| 155 // of all generations just collected (i.e. level and younger). | |
| 156 rs->invalidate_or_clear(gch->get_gen(level), | |
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157 true /* younger */); |
| 0 | 158 } |
| 159 | |
| 160 Threads::gc_epilogue(); | |
| 161 CodeCache::gc_epilogue(); | |
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162 JvmtiExport::gc_epilogue(); |
| 0 | 163 |
| 164 if (PrintGC && !PrintGCDetails) { | |
| 165 gch->print_heap_change(gch_prev_used); | |
| 166 } | |
| 167 | |
| 168 // refs processing: clean slate | |
| 169 _ref_processor = NULL; | |
| 170 | |
| 171 // Update heap occupancy information which is used as | |
| 172 // input to soft ref clearing policy at the next gc. | |
| 173 Universe::update_heap_info_at_gc(); | |
| 174 | |
| 175 // Update time of last gc for all generations we collected | |
| 176 // (which curently is all the generations in the heap). | |
| 4911 | 177 // We need to use a monotonically non-deccreasing time in ms |
| 178 // or we will see time-warp warnings and os::javaTimeMillis() | |
| 179 // does not guarantee monotonicity. | |
| 180 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; | |
| 181 gch->update_time_of_last_gc(now); | |
| 0 | 182 } |
| 183 | |
| 184 void GenMarkSweep::allocate_stacks() { | |
| 185 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 186 // Scratch request on behalf of oldest generation; will do no | |
| 187 // allocation. | |
| 188 ScratchBlock* scratch = gch->gather_scratch(gch->_gens[gch->_n_gens-1], 0); | |
| 189 | |
| 190 // $$$ To cut a corner, we'll only use the first scratch block, and then | |
| 191 // revert to malloc. | |
| 192 if (scratch != NULL) { | |
| 193 _preserved_count_max = | |
| 194 scratch->num_words * HeapWordSize / sizeof(PreservedMark); | |
| 195 } else { | |
| 196 _preserved_count_max = 0; | |
| 197 } | |
| 198 | |
| 199 _preserved_marks = (PreservedMark*)scratch; | |
| 200 _preserved_count = 0; | |
| 201 | |
| 202 #ifdef VALIDATE_MARK_SWEEP | |
| 203 if (ValidateMarkSweep) { | |
| 6197 | 204 _root_refs_stack = new (ResourceObj::C_HEAP, mtGC) GrowableArray<void*>(100, true); |
| 205 _other_refs_stack = new (ResourceObj::C_HEAP, mtGC) GrowableArray<void*>(100, true); | |
| 206 _adjusted_pointers = new (ResourceObj::C_HEAP, mtGC) GrowableArray<void*>(100, true); | |
| 207 _live_oops = new (ResourceObj::C_HEAP, mtGC) GrowableArray<oop>(100, true); | |
| 208 _live_oops_moved_to = new (ResourceObj::C_HEAP, mtGC) GrowableArray<oop>(100, true); | |
| 209 _live_oops_size = new (ResourceObj::C_HEAP, mtGC) GrowableArray<size_t>(100, true); | |
| 0 | 210 } |
| 211 if (RecordMarkSweepCompaction) { | |
| 212 if (_cur_gc_live_oops == NULL) { | |
| 6197 | 213 _cur_gc_live_oops = new(ResourceObj::C_HEAP, mtGC) GrowableArray<HeapWord*>(100, true); |
| 214 _cur_gc_live_oops_moved_to = new(ResourceObj::C_HEAP, mtGC) GrowableArray<HeapWord*>(100, true); | |
| 215 _cur_gc_live_oops_size = new(ResourceObj::C_HEAP, mtGC) GrowableArray<size_t>(100, true); | |
| 216 _last_gc_live_oops = new(ResourceObj::C_HEAP, mtGC) GrowableArray<HeapWord*>(100, true); | |
| 217 _last_gc_live_oops_moved_to = new(ResourceObj::C_HEAP, mtGC) GrowableArray<HeapWord*>(100, true); | |
| 218 _last_gc_live_oops_size = new(ResourceObj::C_HEAP, mtGC) GrowableArray<size_t>(100, true); | |
| 0 | 219 } else { |
| 220 _cur_gc_live_oops->clear(); | |
| 221 _cur_gc_live_oops_moved_to->clear(); | |
| 222 _cur_gc_live_oops_size->clear(); | |
| 223 } | |
| 224 } | |
| 225 #endif | |
| 226 } | |
| 227 | |
| 228 | |
| 229 void GenMarkSweep::deallocate_stacks() { | |
| 356 | 230 if (!UseG1GC) { |
| 231 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 232 gch->release_scratch(); | |
| 233 } | |
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234 |
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235 _preserved_mark_stack.clear(true); |
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236 _preserved_oop_stack.clear(true); |
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237 _marking_stack.clear(); |
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238 _objarray_stack.clear(true); |
| 0 | 239 |
| 240 #ifdef VALIDATE_MARK_SWEEP | |
| 241 if (ValidateMarkSweep) { | |
| 242 delete _root_refs_stack; | |
| 243 delete _other_refs_stack; | |
| 244 delete _adjusted_pointers; | |
| 245 delete _live_oops; | |
| 246 delete _live_oops_size; | |
| 247 delete _live_oops_moved_to; | |
| 248 _live_oops_index = 0; | |
| 249 _live_oops_index_at_perm = 0; | |
| 250 } | |
| 251 #endif | |
| 252 } | |
| 253 | |
| 254 void GenMarkSweep::mark_sweep_phase1(int level, | |
| 255 bool clear_all_softrefs) { | |
| 256 // Recursively traverse all live objects and mark them | |
| 257 TraceTime tm("phase 1", PrintGC && Verbose, true, gclog_or_tty); | |
| 258 trace(" 1"); | |
| 259 | |
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260 VALIDATE_MARK_SWEEP_ONLY(reset_live_oop_tracking()); |
| 0 | 261 |
| 262 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 263 | |
| 264 // Because follow_root_closure is created statically, cannot | |
| 265 // use OopsInGenClosure constructor which takes a generation, | |
| 266 // as the Universe has not been created when the static constructors | |
| 267 // are run. | |
| 268 follow_root_closure.set_orig_generation(gch->get_gen(level)); | |
| 269 | |
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270 // Need new claim bits before marking starts. |
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271 ClassLoaderDataGraph::clear_claimed_marks(); |
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272 |
| 0 | 273 gch->gen_process_strong_roots(level, |
| 274 false, // Younger gens are not roots. | |
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275 true, // activate StrongRootsScope |
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276 false, // not scavenging |
| 0 | 277 SharedHeap::SO_SystemClasses, |
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278 &follow_root_closure, |
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279 true, // walk code active on stacks |
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280 &follow_root_closure, |
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281 &follow_klass_closure); |
| 0 | 282 |
| 283 // Process reference objects found during marking | |
| 284 { | |
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285 ref_processor()->setup_policy(clear_all_softrefs); |
| 0 | 286 ref_processor()->process_discovered_references( |
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287 &is_alive, &keep_alive, &follow_stack_closure, NULL); |
| 0 | 288 } |
| 289 | |
| 290 // Follow system dictionary roots and unload classes | |
| 291 bool purged_class = SystemDictionary::do_unloading(&is_alive); | |
| 292 | |
| 293 // Follow code cache roots | |
| 294 CodeCache::do_unloading(&is_alive, &keep_alive, purged_class); | |
| 295 follow_stack(); // Flush marking stack | |
| 296 | |
| 297 // Update subklass/sibling/implementor links of live klasses | |
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298 Klass::clean_weak_klass_links(&is_alive); |
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299 assert(_marking_stack.is_empty(), "just drained"); |
| 941 | 300 |
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301 // Visit interned string tables and delete unmarked oops |
| 0 | 302 StringTable::unlink(&is_alive); |
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303 // Clean up unreferenced symbols in symbol table. |
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304 SymbolTable::unlink(); |
| 0 | 305 |
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306 assert(_marking_stack.is_empty(), "stack should be empty by now"); |
| 0 | 307 } |
| 308 | |
| 309 | |
| 310 void GenMarkSweep::mark_sweep_phase2() { | |
| 311 // Now all live objects are marked, compute the new object addresses. | |
| 312 | |
| 313 // It is imperative that we traverse perm_gen LAST. If dead space is | |
| 314 // allowed a range of dead object may get overwritten by a dead int | |
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315 // array. If perm_gen is not traversed last a Klass* may get |
| 0 | 316 // overwritten. This is fine since it is dead, but if the class has dead |
| 317 // instances we have to skip them, and in order to find their size we | |
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318 // need the Klass*! |
| 0 | 319 // |
| 320 // It is not required that we traverse spaces in the same order in | |
| 321 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
| 322 // tracking expects us to do so. See comment under phase4. | |
| 323 | |
| 324 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 325 | |
| 326 TraceTime tm("phase 2", PrintGC && Verbose, true, gclog_or_tty); | |
| 327 trace("2"); | |
| 328 | |
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329 VALIDATE_MARK_SWEEP_ONLY(reset_live_oop_tracking()); |
| 0 | 330 |
| 331 gch->prepare_for_compaction(); | |
| 332 } | |
| 333 | |
| 334 class GenAdjustPointersClosure: public GenCollectedHeap::GenClosure { | |
| 335 public: | |
| 336 void do_generation(Generation* gen) { | |
| 337 gen->adjust_pointers(); | |
| 338 } | |
| 339 }; | |
| 340 | |
| 341 void GenMarkSweep::mark_sweep_phase3(int level) { | |
| 342 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 343 | |
| 344 // Adjust the pointers to reflect the new locations | |
| 345 TraceTime tm("phase 3", PrintGC && Verbose, true, gclog_or_tty); | |
| 346 trace("3"); | |
| 347 | |
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348 // Need new claim bits for the pointer adjustment tracing. |
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349 ClassLoaderDataGraph::clear_claimed_marks(); |
| 0 | 350 |
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351 VALIDATE_MARK_SWEEP_ONLY(reset_live_oop_tracking()); |
| 0 | 352 |
| 353 // Because the two closures below are created statically, cannot | |
| 354 // use OopsInGenClosure constructor which takes a generation, | |
| 355 // as the Universe has not been created when the static constructors | |
| 356 // are run. | |
| 357 adjust_root_pointer_closure.set_orig_generation(gch->get_gen(level)); | |
| 358 adjust_pointer_closure.set_orig_generation(gch->get_gen(level)); | |
| 359 | |
| 360 gch->gen_process_strong_roots(level, | |
| 361 false, // Younger gens are not roots. | |
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362 true, // activate StrongRootsScope |
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363 false, // not scavenging |
| 0 | 364 SharedHeap::SO_AllClasses, |
| 365 &adjust_root_pointer_closure, | |
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366 false, // do not walk code |
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367 &adjust_root_pointer_closure, |
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368 &adjust_klass_closure); |
| 0 | 369 |
| 370 // Now adjust pointers in remaining weak roots. (All of which should | |
| 371 // have been cleared if they pointed to non-surviving objects.) | |
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372 CodeBlobToOopClosure adjust_code_pointer_closure(&adjust_pointer_closure, |
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373 /*do_marking=*/ false); |
| 0 | 374 gch->gen_process_weak_roots(&adjust_root_pointer_closure, |
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375 &adjust_code_pointer_closure, |
| 0 | 376 &adjust_pointer_closure); |
| 377 | |
| 378 adjust_marks(); | |
| 379 GenAdjustPointersClosure blk; | |
| 380 gch->generation_iterate(&blk, true); | |
| 381 } | |
| 382 | |
| 383 class GenCompactClosure: public GenCollectedHeap::GenClosure { | |
| 384 public: | |
| 385 void do_generation(Generation* gen) { | |
| 386 gen->compact(); | |
| 387 } | |
| 388 }; | |
| 389 | |
| 390 void GenMarkSweep::mark_sweep_phase4() { | |
| 391 // All pointers are now adjusted, move objects accordingly | |
| 392 | |
| 393 // It is imperative that we traverse perm_gen first in phase4. All | |
| 394 // classes must be allocated earlier than their instances, and traversing | |
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395 // perm_gen first makes sure that all Klass*s have moved to their new |
| 0 | 396 // location before any instance does a dispatch through it's klass! |
| 397 | |
| 398 // The ValidateMarkSweep live oops tracking expects us to traverse spaces | |
| 399 // in the same order in phase2, phase3 and phase4. We don't quite do that | |
| 400 // here (perm_gen first rather than last), so we tell the validate code | |
| 401 // to use a higher index (saved from phase2) when verifying perm_gen. | |
| 402 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 403 | |
| 404 TraceTime tm("phase 4", PrintGC && Verbose, true, gclog_or_tty); | |
| 405 trace("4"); | |
| 406 | |
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407 VALIDATE_MARK_SWEEP_ONLY(reset_live_oop_tracking()); |
| 0 | 408 |
| 409 GenCompactClosure blk; | |
| 410 gch->generation_iterate(&blk, true); | |
| 411 | |
| 412 VALIDATE_MARK_SWEEP_ONLY(compaction_complete()); | |
| 413 } |