1 /* 2 * Copyright (c) 2015, 2019, Red Hat, Inc. All rights reserved. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. 7 * 8 * This code is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 * version 2 for more details (a copy is included in the LICENSE file that 12 * accompanied this code). 13 * 14 * You should have received a copy of the GNU General Public License version 15 * 2 along with this work; if not, write to the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 * or visit www.oracle.com if you need additional information or have any 20 * questions. 21 * 22 */ 23 24 #include "precompiled.hpp" 25 26 #include "classfile/classLoaderDataGraph.hpp" 27 #include "classfile/stringTable.hpp" 28 #include "classfile/systemDictionary.hpp" 29 #include "code/codeCache.hpp" 30 #include "gc/shenandoah/shenandoahClosures.inline.hpp" 31 #include "gc/shenandoah/shenandoahConcurrentRoots.hpp" 32 #include "gc/shenandoah/shenandoahRootProcessor.inline.hpp" 33 #include "gc/shenandoah/shenandoahHeap.inline.hpp" 34 #include "gc/shenandoah/shenandoahPhaseTimings.hpp" 35 #include "gc/shenandoah/shenandoahStringDedup.hpp" 36 #include "gc/shenandoah/shenandoahVMOperations.hpp" 37 #include "jfr/jfr.hpp" 38 #include "memory/iterator.hpp" 39 #include "memory/resourceArea.hpp" 40 #include "memory/universe.hpp" 41 #include "runtime/thread.hpp" 42 #include "services/management.hpp" 43 44 ShenandoahSerialRoot::ShenandoahSerialRoot(ShenandoahSerialRoot::OopsDo oops_do, 45 ShenandoahPhaseTimings::Phase phase, ShenandoahPhaseTimings::ParPhase par_phase) : 46 _oops_do(oops_do), _phase(phase), _par_phase(par_phase) { 47 } 48 49 void ShenandoahSerialRoot::oops_do(OopClosure* cl, uint worker_id) { 50 if (_claimed.try_set()) { 51 ShenandoahWorkerTimingsTracker timer(_phase, _par_phase, worker_id); 52 _oops_do(cl); 53 } 54 } 55 56 // Overwrite the second argument for SD::oops_do, don't include vm global oop storage. 57 static void system_dictionary_oops_do(OopClosure* cl) { 58 SystemDictionary::oops_do(cl, false); 59 } 60 61 ShenandoahSerialRoots::ShenandoahSerialRoots(ShenandoahPhaseTimings::Phase phase) : 62 _universe_root(&Universe::oops_do, phase, ShenandoahPhaseTimings::UniverseRoots), 63 _object_synchronizer_root(&ObjectSynchronizer::oops_do, phase, ShenandoahPhaseTimings::ObjectSynchronizerRoots), 64 _management_root(&Management::oops_do, phase, ShenandoahPhaseTimings::ManagementRoots), 65 _system_dictionary_root(&system_dictionary_oops_do, phase, ShenandoahPhaseTimings::SystemDictionaryRoots), 66 _jvmti_root(&JvmtiExport::oops_do, phase, ShenandoahPhaseTimings::JVMTIRoots) { 67 } 68 69 void ShenandoahSerialRoots::oops_do(OopClosure* cl, uint worker_id) { 70 _universe_root.oops_do(cl, worker_id); 71 _object_synchronizer_root.oops_do(cl, worker_id); 72 _management_root.oops_do(cl, worker_id); 73 _system_dictionary_root.oops_do(cl, worker_id); 74 _jvmti_root.oops_do(cl, worker_id); 75 } 76 77 ShenandoahWeakSerialRoot::ShenandoahWeakSerialRoot(ShenandoahWeakSerialRoot::WeakOopsDo weak_oops_do, 78 ShenandoahPhaseTimings::Phase phase, ShenandoahPhaseTimings::ParPhase par_phase) : 79 _weak_oops_do(weak_oops_do), _phase(phase), _par_phase(par_phase) { 80 } 81 82 void ShenandoahWeakSerialRoot::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, uint worker_id) { 83 if (_claimed.try_set()) { 84 ShenandoahWorkerTimingsTracker timer(_phase, _par_phase, worker_id); 85 _weak_oops_do(is_alive, keep_alive); 86 } 87 } 88 89 #if INCLUDE_JVMTI 90 ShenandoahJVMTIWeakRoot::ShenandoahJVMTIWeakRoot(ShenandoahPhaseTimings::Phase phase) : 91 ShenandoahWeakSerialRoot(&JvmtiExport::weak_oops_do, phase, ShenandoahPhaseTimings::JVMTIWeakRoots) { 92 } 93 #endif // INCLUDE_JVMTI 94 95 #if INCLUDE_JFR 96 ShenandoahJFRWeakRoot::ShenandoahJFRWeakRoot(ShenandoahPhaseTimings::Phase phase) : 97 ShenandoahWeakSerialRoot(&Jfr::weak_oops_do, phase, ShenandoahPhaseTimings::JFRWeakRoots) { 98 } 99 #endif // INCLUDE_JFR 100 101 void ShenandoahSerialWeakRoots::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, uint worker_id) { 102 JVMTI_ONLY(_jvmti_weak_roots.weak_oops_do(is_alive, keep_alive, worker_id);) 103 JFR_ONLY(_jfr_weak_roots.weak_oops_do(is_alive, keep_alive, worker_id);) 104 } 105 106 void ShenandoahSerialWeakRoots::weak_oops_do(OopClosure* cl, uint worker_id) { 107 AlwaysTrueClosure always_true; 108 weak_oops_do(&always_true, cl, worker_id); 109 } 110 111 ShenandoahThreadRoots::ShenandoahThreadRoots(ShenandoahPhaseTimings::Phase phase, bool is_par) : 112 _phase(phase), _is_par(is_par) { 113 Threads::change_thread_claim_token(); 114 } 115 116 void ShenandoahThreadRoots::oops_do(OopClosure* oops_cl, CodeBlobClosure* code_cl, uint worker_id) { 117 ShenandoahWorkerTimingsTracker timer(_phase, ShenandoahPhaseTimings::ThreadRoots, worker_id); 118 ResourceMark rm; 119 Threads::possibly_parallel_oops_do(_is_par, oops_cl, code_cl); 120 } 121 122 void ShenandoahThreadRoots::threads_do(ThreadClosure* tc, uint worker_id) { 123 ShenandoahWorkerTimingsTracker timer(_phase, ShenandoahPhaseTimings::ThreadRoots, worker_id); 124 ResourceMark rm; 125 Threads::possibly_parallel_threads_do(_is_par, tc); 126 } 127 128 ShenandoahThreadRoots::~ShenandoahThreadRoots() { 129 Threads::assert_all_threads_claimed(); 130 } 131 132 ShenandoahStringDedupRoots::ShenandoahStringDedupRoots(ShenandoahPhaseTimings::Phase phase) : _phase(phase) { 133 if (ShenandoahStringDedup::is_enabled()) { 134 StringDedup::gc_prologue(false); 135 } 136 } 137 138 ShenandoahStringDedupRoots::~ShenandoahStringDedupRoots() { 139 if (ShenandoahStringDedup::is_enabled()) { 140 StringDedup::gc_epilogue(); 141 } 142 } 143 144 void ShenandoahStringDedupRoots::oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, uint worker_id) { 145 if (ShenandoahStringDedup::is_enabled()) { 146 ShenandoahStringDedup::parallel_oops_do(_phase, is_alive, keep_alive, worker_id); 147 } 148 } 149 150 ShenandoahRootProcessor::ShenandoahRootProcessor(ShenandoahPhaseTimings::Phase phase) : 151 _heap(ShenandoahHeap::heap()), 152 _phase(phase), 153 _worker_phase(phase) { 154 assert(SafepointSynchronize::is_at_safepoint(), "Must at safepoint"); 155 } 156 157 ShenandoahRootEvacuator::ShenandoahRootEvacuator(uint n_workers, 158 ShenandoahPhaseTimings::Phase phase, 159 bool stw_roots_processing, 160 bool stw_class_unloading) : 161 ShenandoahRootProcessor(phase), 162 _serial_roots(phase), 163 _vm_roots(phase), 164 _cld_roots(phase), 165 _thread_roots(phase, n_workers > 1), 166 _serial_weak_roots(phase), 167 _weak_roots(phase), 168 _dedup_roots(phase), 169 _code_roots(phase), 170 _stw_roots_processing(stw_roots_processing), 171 _stw_class_unloading(stw_class_unloading) { 172 } 173 174 void ShenandoahRootEvacuator::roots_do(uint worker_id, OopClosure* oops) { 175 MarkingCodeBlobClosure blobsCl(oops, CodeBlobToOopClosure::FixRelocations); 176 ShenandoahCodeBlobAndDisarmClosure blobs_and_disarm_Cl(oops); 177 CodeBlobToOopClosure* codes_cl = ShenandoahConcurrentRoots::can_do_concurrent_class_unloading() ? 178 static_cast<CodeBlobToOopClosure*>(&blobs_and_disarm_Cl) : 179 static_cast<CodeBlobToOopClosure*>(&blobsCl); 180 AlwaysTrueClosure always_true; 181 182 _serial_roots.oops_do(oops, worker_id); 183 _serial_weak_roots.weak_oops_do(oops, worker_id); 184 if (_stw_roots_processing) { 185 _vm_roots.oops_do<OopClosure>(oops, worker_id); 186 _weak_roots.oops_do<OopClosure>(oops, worker_id); 187 } 188 189 if (_stw_class_unloading) { 190 CLDToOopClosure clds(oops, ClassLoaderData::_claim_strong); 191 _cld_roots.cld_do(&clds, worker_id); 192 _code_roots.code_blobs_do(codes_cl, worker_id); 193 _thread_roots.oops_do(oops, NULL, worker_id); 194 } else { 195 _thread_roots.oops_do(oops, codes_cl, worker_id); 196 } 197 198 _dedup_roots.oops_do(&always_true, oops, worker_id); 199 } 200 201 ShenandoahRootUpdater::ShenandoahRootUpdater(uint n_workers, ShenandoahPhaseTimings::Phase phase) : 202 ShenandoahRootProcessor(phase), 203 _serial_roots(phase), 204 _vm_roots(phase), 205 _cld_roots(phase), 206 _thread_roots(phase, n_workers > 1), 207 _serial_weak_roots(phase), 208 _weak_roots(phase), 209 _dedup_roots(phase), 210 _code_roots(phase) { 211 } 212 213 ShenandoahRootAdjuster::ShenandoahRootAdjuster(uint n_workers, ShenandoahPhaseTimings::Phase phase) : 214 ShenandoahRootProcessor(phase), 215 _serial_roots(phase), 216 _vm_roots(phase), 217 _cld_roots(phase), 218 _thread_roots(phase, n_workers > 1), 219 _serial_weak_roots(phase), 220 _weak_roots(phase), 221 _dedup_roots(phase), 222 _code_roots(phase) { 223 assert(ShenandoahHeap::heap()->is_full_gc_in_progress(), "Full GC only"); 224 } 225 226 void ShenandoahRootAdjuster::roots_do(uint worker_id, OopClosure* oops) { 227 CodeBlobToOopClosure code_blob_cl(oops, CodeBlobToOopClosure::FixRelocations); 228 ShenandoahCodeBlobAndDisarmClosure blobs_and_disarm_Cl(oops); 229 CodeBlobToOopClosure* adjust_code_closure = ShenandoahConcurrentRoots::can_do_concurrent_class_unloading() ? 230 static_cast<CodeBlobToOopClosure*>(&blobs_and_disarm_Cl) : 231 static_cast<CodeBlobToOopClosure*>(&code_blob_cl); 232 CLDToOopClosure adjust_cld_closure(oops, ClassLoaderData::_claim_strong); 233 AlwaysTrueClosure always_true; 234 235 _serial_roots.oops_do(oops, worker_id); 236 _vm_roots.oops_do(oops, worker_id); 237 238 _thread_roots.oops_do(oops, NULL, worker_id); 239 _cld_roots.cld_do(&adjust_cld_closure, worker_id); 240 _code_roots.code_blobs_do(adjust_code_closure, worker_id); 241 242 _serial_weak_roots.weak_oops_do(oops, worker_id); 243 _weak_roots.oops_do<OopClosure>(oops, worker_id); 244 _dedup_roots.oops_do(&always_true, oops, worker_id); 245 } 246 247 ShenandoahHeapIterationRootScanner::ShenandoahHeapIterationRootScanner() : 248 ShenandoahRootProcessor(ShenandoahPhaseTimings::heap_iteration_roots), 249 _serial_roots(ShenandoahPhaseTimings::heap_iteration_roots), 250 _thread_roots(ShenandoahPhaseTimings::heap_iteration_roots, false /*is par*/), 251 _vm_roots(ShenandoahPhaseTimings::heap_iteration_roots), 252 _cld_roots(ShenandoahPhaseTimings::heap_iteration_roots), 253 _serial_weak_roots(ShenandoahPhaseTimings::heap_iteration_roots), 254 _weak_roots(ShenandoahPhaseTimings::heap_iteration_roots), 255 _dedup_roots(ShenandoahPhaseTimings::heap_iteration_roots), 256 _code_roots(ShenandoahPhaseTimings::heap_iteration_roots) { 257 } 258 259 void ShenandoahHeapIterationRootScanner::roots_do(OopClosure* oops) { 260 assert(Thread::current()->is_VM_thread(), "Only by VM thread"); 261 // Must use _claim_none to avoid interfering with concurrent CLDG iteration 262 CLDToOopClosure clds(oops, ClassLoaderData::_claim_none); 263 MarkingCodeBlobClosure code(oops, !CodeBlobToOopClosure::FixRelocations); 264 ShenandoahParallelOopsDoThreadClosure tc_cl(oops, &code, NULL); 265 AlwaysTrueClosure always_true; 266 ResourceMark rm; 267 268 _serial_roots.oops_do(oops, 0); 269 _vm_roots.oops_do(oops, 0); 270 _cld_roots.cld_do(&clds, 0); 271 _thread_roots.threads_do(&tc_cl, 0); 272 _code_roots.code_blobs_do(&code, 0); 273 274 _serial_weak_roots.weak_oops_do(oops, 0); 275 _weak_roots.oops_do<OopClosure>(oops, 0); 276 _dedup_roots.oops_do(&always_true, oops, 0); 277 }