1 /* 2 * Copyright (c) 2015, 2018, 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/classLoaderData.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/shenandoahRootProcessor.inline.hpp" 32 #include "gc/shenandoah/shenandoahHeap.inline.hpp" 33 #include "gc/shenandoah/shenandoahPhaseTimings.hpp" 34 #include "gc/shenandoah/shenandoahStringDedup.hpp" 35 #include "gc/shenandoah/shenandoahVMOperations.hpp" 36 #include "gc/shenandoah/heuristics/shenandoahHeuristics.hpp" 37 #include "gc/shared/weakProcessor.hpp" 38 #include "memory/allocation.inline.hpp" 39 #include "memory/iterator.hpp" 40 #include "memory/resourceArea.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 ShenandoahSerialRoots::ShenandoahSerialRoots(ShenandoahPhaseTimings::Phase phase) : 57 _universe_root(&ShenandoahSerialRoots::universe_oops_do, phase, ShenandoahPhaseTimings::UniverseRoots), 58 _object_synchronizer_root(&ObjectSynchronizer::oops_do, phase, ShenandoahPhaseTimings::ObjectSynchronizerRoots), 59 _management_root(&Management::oops_do, phase, ShenandoahPhaseTimings::ManagementRoots), 60 _system_dictionary_root(&SystemDictionary::oops_do, phase, ShenandoahPhaseTimings::SystemDictionaryRoots), 61 _jvmti_root(&JvmtiExport::oops_do, phase, ShenandoahPhaseTimings::JVMTIRoots) { 62 } 63 64 void ShenandoahSerialRoots::oops_do(OopClosure* cl, uint worker_id) { 65 _universe_root.oops_do(cl, worker_id); 66 _object_synchronizer_root.oops_do(cl, worker_id); 67 _management_root.oops_do(cl, worker_id); 68 _system_dictionary_root.oops_do(cl, worker_id); 69 _jvmti_root.oops_do(cl, worker_id); 70 } 71 72 ShenandoahJNIHandleRoots::ShenandoahJNIHandleRoots(ShenandoahPhaseTimings::Phase phase) : 73 ShenandoahSerialRoot(&JNIHandles::oops_do, phase, ShenandoahPhaseTimings::JNIRoots) { 74 } 75 76 ShenandoahThreadRoots::ShenandoahThreadRoots(ShenandoahPhaseTimings::Phase phase, bool is_par) : 77 _phase(phase), _is_par(is_par) { 78 Threads::change_thread_claim_parity(); 79 } 80 81 void ShenandoahThreadRoots::oops_do(OopClosure* oops_cl, CodeBlobClosure* code_cl, uint worker_id) { 82 ShenandoahWorkerTimingsTracker timer(_phase, ShenandoahPhaseTimings::ThreadRoots, worker_id); 83 ResourceMark rm; 84 Threads::possibly_parallel_oops_do(_is_par, oops_cl, code_cl); 85 } 86 87 void ShenandoahThreadRoots::threads_do(ThreadClosure* tc, uint worker_id) { 88 ShenandoahWorkerTimingsTracker timer(_phase, ShenandoahPhaseTimings::ThreadRoots, worker_id); 89 ResourceMark rm; 90 Threads::possibly_parallel_threads_do(_is_par, tc); 91 } 92 93 ShenandoahThreadRoots::~ShenandoahThreadRoots() { 94 Threads::assert_all_threads_claimed(); 95 } 96 97 ShenandoahWeakRoots::ShenandoahWeakRoots(ShenandoahPhaseTimings::Phase phase, uint n_workers) : 98 _phase(phase), 99 _par_state_string(StringTable::weak_storage()), 100 _claimed(false) { 101 } 102 103 ShenandoahWeakRoots::~ShenandoahWeakRoots() { 104 } 105 106 ShenandoahStringDedupRoots::ShenandoahStringDedupRoots(ShenandoahPhaseTimings::Phase phase) : _phase(phase) { 107 if (ShenandoahStringDedup::is_enabled()) { 108 StringDedup::gc_prologue(false); 109 } 110 } 111 112 ShenandoahStringDedupRoots::~ShenandoahStringDedupRoots() { 113 if (ShenandoahStringDedup::is_enabled()) { 114 StringDedup::gc_epilogue(); 115 } 116 } 117 118 void ShenandoahStringDedupRoots::oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, uint worker_id) { 119 if (ShenandoahStringDedup::is_enabled()) { 120 ShenandoahStringDedup::parallel_oops_do(_phase, is_alive, keep_alive, worker_id); 121 } 122 } 123 124 ShenandoahRootProcessor::ShenandoahRootProcessor(ShenandoahPhaseTimings::Phase phase) : 125 _heap(ShenandoahHeap::heap()), 126 _phase(phase), 127 _worker_phase(phase) { 128 assert(SafepointSynchronize::is_at_safepoint(), "Must at safepoint"); 129 } 130 131 ShenandoahRootEvacuator::ShenandoahRootEvacuator(uint n_workers, ShenandoahPhaseTimings::Phase phase) : 132 ShenandoahRootProcessor(phase), 133 _serial_roots(phase), 134 _jni_roots(phase), 135 _cld_roots(phase, n_workers), 136 _thread_roots(phase, n_workers > 1), 137 _weak_roots(phase, n_workers), 138 _dedup_roots(phase), 139 _code_roots(phase) { 140 } 141 142 void ShenandoahRootEvacuator::roots_do(uint worker_id, OopClosure* oops) { 143 MarkingCodeBlobClosure blobsCl(oops, CodeBlobToOopClosure::FixRelocations); 144 CLDToOopClosure clds(oops); 145 146 AlwaysTrueClosure always_true; 147 148 // Process serial-claiming roots first 149 _serial_roots.oops_do(oops, worker_id); 150 _jni_roots.oops_do(oops, worker_id); 151 152 // Process light-weight/limited parallel roots then 153 _weak_roots.oops_do<AlwaysTrueClosure, OopClosure>(&always_true, oops, worker_id); 154 _dedup_roots.oops_do(&always_true, oops, worker_id); 155 _cld_roots.cld_do(&clds, worker_id); 156 157 // Process heavy-weight/fully parallel roots the last 158 _code_roots.code_blobs_do(&blobsCl, worker_id); 159 _thread_roots.oops_do(oops, NULL, worker_id); 160 } 161 162 ShenandoahRootUpdater::ShenandoahRootUpdater(uint n_workers, ShenandoahPhaseTimings::Phase phase, bool update_code_cache) : 163 ShenandoahRootProcessor(phase), 164 _serial_roots(phase), 165 _jni_roots(phase), 166 _cld_roots(phase, n_workers), 167 _thread_roots(phase, n_workers > 1), 168 _weak_roots(phase, n_workers), 169 _dedup_roots(phase), 170 _code_roots(phase), 171 _update_code_cache(update_code_cache) { 172 } 173 174 ShenandoahRootAdjuster::ShenandoahRootAdjuster(uint n_workers, ShenandoahPhaseTimings::Phase phase) : 175 ShenandoahRootProcessor(phase), 176 _serial_roots(phase), 177 _jni_roots(phase), 178 _cld_roots(phase, n_workers), 179 _thread_roots(phase, n_workers > 1), 180 _weak_roots(phase, n_workers), 181 _dedup_roots(phase), 182 _code_roots(phase) { 183 assert(ShenandoahHeap::heap()->is_full_gc_in_progress(), "Full GC only"); 184 } 185 186 void ShenandoahRootAdjuster::roots_do(uint worker_id, OopClosure* oops) { 187 CodeBlobToOopClosure adjust_code_closure(oops, CodeBlobToOopClosure::FixRelocations); 188 CLDToOopClosure adjust_cld_closure(oops); 189 AlwaysTrueClosure always_true; 190 191 // Process serial-claiming roots first 192 _serial_roots.oops_do(oops, worker_id); 193 _jni_roots.oops_do(oops, worker_id); 194 195 // Process light-weight/limited parallel roots then 196 _weak_roots.oops_do<AlwaysTrueClosure, OopClosure>(&always_true, oops, worker_id); 197 _dedup_roots.oops_do(&always_true, oops, worker_id); 198 _cld_roots.cld_do(&adjust_cld_closure, worker_id); 199 200 // Process heavy-weight/fully parallel roots the last 201 _code_roots.code_blobs_do(&adjust_code_closure, worker_id); 202 _thread_roots.oops_do(oops, NULL, worker_id); 203 } 204 205 ShenandoahHeapIterationRootScanner::ShenandoahHeapIterationRootScanner() : 206 ShenandoahRootProcessor(ShenandoahPhaseTimings::heap_iteration_roots), 207 _serial_roots(ShenandoahPhaseTimings::heap_iteration_roots), 208 _thread_roots(ShenandoahPhaseTimings::heap_iteration_roots, false /*is par*/), 209 _jni_roots(ShenandoahPhaseTimings::heap_iteration_roots), 210 _cld_roots(ShenandoahPhaseTimings::heap_iteration_roots, 1), 211 _weak_roots(ShenandoahPhaseTimings::heap_iteration_roots, 1), 212 _dedup_roots(ShenandoahPhaseTimings::heap_iteration_roots), 213 _code_roots(ShenandoahPhaseTimings::heap_iteration_roots) 214 { } 215 216 void ShenandoahHeapIterationRootScanner::roots_do(OopClosure* oops) { 217 assert(Thread::current()->is_VM_thread(), "Only by VM thread"); 218 // Must use _claim_none to avoid interfering with concurrent CLDG iteration 219 CLDToOopClosure clds(oops, false); 220 MarkingCodeBlobClosure code(oops, !CodeBlobToOopClosure::FixRelocations); 221 ShenandoahParallelOopsDoThreadClosure tc_cl(oops, &code, NULL); 222 AlwaysTrueClosure always_true; 223 ResourceMark rm; 224 225 // Process serial-claiming roots first 226 _serial_roots.oops_do(oops, 0); 227 _jni_roots.oops_do(oops, 0); 228 229 // Process light-weight/limited parallel roots then 230 _weak_roots.oops_do<AlwaysTrueClosure, OopClosure>(&always_true, oops, 0); 231 _dedup_roots.oops_do(&always_true, oops, 0); 232 _cld_roots.cld_do(&clds, 0); 233 234 // Process heavy-weight/fully parallel roots the last 235 _code_roots.code_blobs_do(&code, 0); 236 _thread_roots.threads_do(&tc_cl, 0); 237 238 }