Mercurial > hg > truffle
annotate src/share/vm/memory/genMarkSweep.cpp @ 10188:2f50bc369470
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
Reviewed-by: coleenp, mgerdin
| author | stefank |
|---|---|
| date | Fri, 26 Apr 2013 10:40:36 +0200 |
| parents | a08c80e9e1e5 |
| children | f2110083203d |
| 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" | |
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46 #include "runtime/thread.inline.hpp" |
| 1972 | 47 #include "runtime/vmThread.hpp" |
| 48 #include "utilities/copy.hpp" | |
| 49 #include "utilities/events.hpp" | |
| 0 | 50 |
| 51 void GenMarkSweep::invoke_at_safepoint(int level, ReferenceProcessor* rp, | |
| 52 bool clear_all_softrefs) { | |
| 53 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
| 54 | |
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55 GenCollectedHeap* gch = GenCollectedHeap::heap(); |
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56 #ifdef ASSERT |
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57 if (gch->collector_policy()->should_clear_all_soft_refs()) { |
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58 assert(clear_all_softrefs, "Policy should have been checked earlier"); |
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59 } |
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60 #endif |
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61 |
| 0 | 62 // hook up weak ref data so it can be used during Mark-Sweep |
| 63 assert(ref_processor() == NULL, "no stomping"); | |
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64 assert(rp != NULL, "should be non-NULL"); |
| 0 | 65 _ref_processor = rp; |
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66 rp->setup_policy(clear_all_softrefs); |
| 0 | 67 |
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68 TraceTime t1(GCCauseString("Full GC", gch->gc_cause()), PrintGC && !PrintGCDetails, true, gclog_or_tty); |
| 0 | 69 |
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70 // When collecting the permanent generation Method*s may be moving, |
| 0 | 71 // so we either have to flush all bcp data or convert it into bci. |
| 72 CodeCache::gc_prologue(); | |
| 73 Threads::gc_prologue(); | |
| 74 | |
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75 // Increment the invocation count |
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76 _total_invocations++; |
| 0 | 77 |
| 78 // Capture heap size before collection for printing. | |
| 79 size_t gch_prev_used = gch->used(); | |
| 80 | |
| 81 // Some of the card table updates below assume that the perm gen is | |
| 82 // also being collected. | |
| 83 assert(level == gch->n_gens() - 1, | |
| 84 "All generations are being collected, ergo perm gen too."); | |
| 85 | |
| 86 // Capture used regions for each generation that will be | |
| 87 // subject to collection, so that card table adjustments can | |
| 88 // be made intelligently (see clear / invalidate further below). | |
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89 gch->save_used_regions(level); |
| 0 | 90 |
| 91 allocate_stacks(); | |
| 92 | |
| 93 mark_sweep_phase1(level, clear_all_softrefs); | |
| 94 | |
| 95 mark_sweep_phase2(); | |
| 96 | |
| 97 // Don't add any more derived pointers during phase3 | |
| 98 COMPILER2_PRESENT(assert(DerivedPointerTable::is_active(), "Sanity")); | |
| 99 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
| 100 | |
| 101 mark_sweep_phase3(level); | |
| 102 | |
| 103 mark_sweep_phase4(); | |
| 104 | |
| 105 restore_marks(); | |
| 106 | |
| 107 // Set saved marks for allocation profiler (and other things? -- dld) | |
| 108 // (Should this be in general part?) | |
| 109 gch->save_marks(); | |
| 110 | |
| 111 deallocate_stacks(); | |
| 112 | |
| 113 // If compaction completely evacuated all generations younger than this | |
| 114 // one, then we can clear the card table. Otherwise, we must invalidate | |
| 115 // it (consider all cards dirty). In the future, we might consider doing | |
| 116 // compaction within generations only, and doing card-table sliding. | |
| 117 bool all_empty = true; | |
| 118 for (int i = 0; all_empty && i < level; i++) { | |
| 119 Generation* g = gch->get_gen(i); | |
| 120 all_empty = all_empty && gch->get_gen(i)->used() == 0; | |
| 121 } | |
| 122 GenRemSet* rs = gch->rem_set(); | |
| 123 // Clear/invalidate below make use of the "prev_used_regions" saved earlier. | |
| 124 if (all_empty) { | |
| 125 // We've evacuated all generations below us. | |
| 126 Generation* g = gch->get_gen(level); | |
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127 rs->clear_into_younger(g); |
| 0 | 128 } else { |
| 129 // Invalidate the cards corresponding to the currently used | |
| 130 // region and clear those corresponding to the evacuated region | |
| 131 // of all generations just collected (i.e. level and younger). | |
| 132 rs->invalidate_or_clear(gch->get_gen(level), | |
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133 true /* younger */); |
| 0 | 134 } |
| 135 | |
| 136 Threads::gc_epilogue(); | |
| 137 CodeCache::gc_epilogue(); | |
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138 JvmtiExport::gc_epilogue(); |
| 0 | 139 |
| 140 if (PrintGC && !PrintGCDetails) { | |
| 141 gch->print_heap_change(gch_prev_used); | |
| 142 } | |
| 143 | |
| 144 // refs processing: clean slate | |
| 145 _ref_processor = NULL; | |
| 146 | |
| 147 // Update heap occupancy information which is used as | |
| 148 // input to soft ref clearing policy at the next gc. | |
| 149 Universe::update_heap_info_at_gc(); | |
| 150 | |
| 151 // Update time of last gc for all generations we collected | |
| 152 // (which curently is all the generations in the heap). | |
| 4911 | 153 // We need to use a monotonically non-deccreasing time in ms |
| 154 // or we will see time-warp warnings and os::javaTimeMillis() | |
| 155 // does not guarantee monotonicity. | |
| 156 jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; | |
| 157 gch->update_time_of_last_gc(now); | |
| 0 | 158 } |
| 159 | |
| 160 void GenMarkSweep::allocate_stacks() { | |
| 161 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 162 // Scratch request on behalf of oldest generation; will do no | |
| 163 // allocation. | |
| 164 ScratchBlock* scratch = gch->gather_scratch(gch->_gens[gch->_n_gens-1], 0); | |
| 165 | |
| 166 // $$$ To cut a corner, we'll only use the first scratch block, and then | |
| 167 // revert to malloc. | |
| 168 if (scratch != NULL) { | |
| 169 _preserved_count_max = | |
| 170 scratch->num_words * HeapWordSize / sizeof(PreservedMark); | |
| 171 } else { | |
| 172 _preserved_count_max = 0; | |
| 173 } | |
| 174 | |
| 175 _preserved_marks = (PreservedMark*)scratch; | |
| 176 _preserved_count = 0; | |
| 177 } | |
| 178 | |
| 179 | |
| 180 void GenMarkSweep::deallocate_stacks() { | |
| 356 | 181 if (!UseG1GC) { |
| 182 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 183 gch->release_scratch(); | |
| 184 } | |
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185 |
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186 _preserved_mark_stack.clear(true); |
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187 _preserved_oop_stack.clear(true); |
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188 _marking_stack.clear(); |
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189 _objarray_stack.clear(true); |
| 0 | 190 } |
| 191 | |
| 192 void GenMarkSweep::mark_sweep_phase1(int level, | |
| 193 bool clear_all_softrefs) { | |
| 194 // Recursively traverse all live objects and mark them | |
| 195 TraceTime tm("phase 1", PrintGC && Verbose, true, gclog_or_tty); | |
| 196 trace(" 1"); | |
| 197 | |
| 198 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 199 | |
| 200 // Because follow_root_closure is created statically, cannot | |
| 201 // use OopsInGenClosure constructor which takes a generation, | |
| 202 // as the Universe has not been created when the static constructors | |
| 203 // are run. | |
| 204 follow_root_closure.set_orig_generation(gch->get_gen(level)); | |
| 205 | |
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206 // Need new claim bits before marking starts. |
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207 ClassLoaderDataGraph::clear_claimed_marks(); |
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208 |
| 0 | 209 gch->gen_process_strong_roots(level, |
| 210 false, // Younger gens are not roots. | |
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211 true, // activate StrongRootsScope |
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212 false, // not scavenging |
| 0 | 213 SharedHeap::SO_SystemClasses, |
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214 &follow_root_closure, |
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215 true, // walk code active on stacks |
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216 &follow_root_closure, |
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217 &follow_klass_closure); |
| 0 | 218 |
| 219 // Process reference objects found during marking | |
| 220 { | |
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221 ref_processor()->setup_policy(clear_all_softrefs); |
| 0 | 222 ref_processor()->process_discovered_references( |
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223 &is_alive, &keep_alive, &follow_stack_closure, NULL); |
| 0 | 224 } |
| 225 | |
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226 // This is the point where the entire marking should have completed. |
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227 assert(_marking_stack.is_empty(), "Marking should have completed"); |
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228 |
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229 // Unload classes and purge the SystemDictionary. |
| 0 | 230 bool purged_class = SystemDictionary::do_unloading(&is_alive); |
| 231 | |
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232 // Unload nmethods. |
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233 CodeCache::do_unloading(&is_alive, purged_class); |
| 0 | 234 |
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235 // Prune dead klasses from subklass/sibling/implementor lists. |
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236 Klass::clean_weak_klass_links(&is_alive); |
| 941 | 237 |
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238 // Delete entries for dead interned strings. |
| 0 | 239 StringTable::unlink(&is_alive); |
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240 |
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241 // Clean up unreferenced symbols in symbol table. |
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242 SymbolTable::unlink(); |
| 0 | 243 } |
| 244 | |
| 245 | |
| 246 void GenMarkSweep::mark_sweep_phase2() { | |
| 247 // Now all live objects are marked, compute the new object addresses. | |
| 248 | |
| 249 // It is imperative that we traverse perm_gen LAST. If dead space is | |
| 250 // allowed a range of dead object may get overwritten by a dead int | |
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251 // array. If perm_gen is not traversed last a Klass* may get |
| 0 | 252 // overwritten. This is fine since it is dead, but if the class has dead |
| 253 // instances we have to skip them, and in order to find their size we | |
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254 // need the Klass*! |
| 0 | 255 // |
| 256 // It is not required that we traverse spaces in the same order in | |
| 257 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
| 258 // tracking expects us to do so. See comment under phase4. | |
| 259 | |
| 260 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 261 | |
| 262 TraceTime tm("phase 2", PrintGC && Verbose, true, gclog_or_tty); | |
| 263 trace("2"); | |
| 264 | |
| 265 gch->prepare_for_compaction(); | |
| 266 } | |
| 267 | |
| 268 class GenAdjustPointersClosure: public GenCollectedHeap::GenClosure { | |
| 269 public: | |
| 270 void do_generation(Generation* gen) { | |
| 271 gen->adjust_pointers(); | |
| 272 } | |
| 273 }; | |
| 274 | |
| 275 void GenMarkSweep::mark_sweep_phase3(int level) { | |
| 276 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 277 | |
| 278 // Adjust the pointers to reflect the new locations | |
| 279 TraceTime tm("phase 3", PrintGC && Verbose, true, gclog_or_tty); | |
| 280 trace("3"); | |
| 281 | |
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282 // Need new claim bits for the pointer adjustment tracing. |
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283 ClassLoaderDataGraph::clear_claimed_marks(); |
| 0 | 284 |
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285 // Because the closure below is created statically, we cannot |
| 0 | 286 // use OopsInGenClosure constructor which takes a generation, |
| 287 // as the Universe has not been created when the static constructors | |
| 288 // are run. | |
| 289 adjust_pointer_closure.set_orig_generation(gch->get_gen(level)); | |
| 290 | |
| 291 gch->gen_process_strong_roots(level, | |
| 292 false, // Younger gens are not roots. | |
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293 true, // activate StrongRootsScope |
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294 false, // not scavenging |
| 0 | 295 SharedHeap::SO_AllClasses, |
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296 &adjust_pointer_closure, |
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297 false, // do not walk code |
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298 &adjust_pointer_closure, |
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299 &adjust_klass_closure); |
| 0 | 300 |
| 301 // Now adjust pointers in remaining weak roots. (All of which should | |
| 302 // have been cleared if they pointed to non-surviving objects.) | |
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303 CodeBlobToOopClosure adjust_code_pointer_closure(&adjust_pointer_closure, |
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304 /*do_marking=*/ false); |
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305 gch->gen_process_weak_roots(&adjust_pointer_closure, |
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306 &adjust_code_pointer_closure); |
| 0 | 307 |
| 308 adjust_marks(); | |
| 309 GenAdjustPointersClosure blk; | |
| 310 gch->generation_iterate(&blk, true); | |
| 311 } | |
| 312 | |
| 313 class GenCompactClosure: public GenCollectedHeap::GenClosure { | |
| 314 public: | |
| 315 void do_generation(Generation* gen) { | |
| 316 gen->compact(); | |
| 317 } | |
| 318 }; | |
| 319 | |
| 320 void GenMarkSweep::mark_sweep_phase4() { | |
| 321 // All pointers are now adjusted, move objects accordingly | |
| 322 | |
| 323 // It is imperative that we traverse perm_gen first in phase4. All | |
| 324 // classes must be allocated earlier than their instances, and traversing | |
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325 // perm_gen first makes sure that all Klass*s have moved to their new |
| 0 | 326 // location before any instance does a dispatch through it's klass! |
| 327 | |
| 328 // The ValidateMarkSweep live oops tracking expects us to traverse spaces | |
| 329 // in the same order in phase2, phase3 and phase4. We don't quite do that | |
| 330 // here (perm_gen first rather than last), so we tell the validate code | |
| 331 // to use a higher index (saved from phase2) when verifying perm_gen. | |
| 332 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 333 | |
| 334 TraceTime tm("phase 4", PrintGC && Verbose, true, gclog_or_tty); | |
| 335 trace("4"); | |
| 336 | |
| 337 GenCompactClosure blk; | |
| 338 gch->generation_iterate(&blk, true); | |
| 339 } |