1 /* 2 * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved. 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 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 #include "precompiled.hpp" 25 #include "gc/z/zHeap.hpp" 26 #include "gc/z/zOopClosures.inline.hpp" 27 #include "gc/z/zPage.hpp" 28 #include "gc/z/zRelocate.hpp" 29 #include "gc/z/zRelocationSet.inline.hpp" 30 #include "gc/z/zRootsIterator.hpp" 31 #include "gc/z/zTask.hpp" 32 #include "gc/z/zWorkers.hpp" 33 34 ZRelocate::ZRelocate(ZWorkers* workers) : 35 _workers(workers) {} 36 37 class ZRelocateRootsIteratorClosure : public ZRootsIteratorClosure { 38 public: 39 virtual void do_thread(Thread* thread) { 40 ZRootsIteratorClosure::do_thread(thread); 41 42 // Update thread local address bad mask 43 ZThreadLocalData::set_address_bad_mask(thread, ZAddressBadMask); 44 } 45 46 virtual void do_oop(oop* p) { 47 ZBarrier::relocate_barrier_on_root_oop_field(p); 48 } 49 50 virtual void do_oop(narrowOop* p) { 51 ShouldNotReachHere(); 52 } 53 }; 54 55 class ZRelocateRootsTask : public ZTask { 56 private: 57 ZRootsIterator _roots; 58 59 public: 60 ZRelocateRootsTask() : 61 ZTask("ZRelocateRootsTask"), 62 _roots() {} 63 64 virtual void work() { 65 // During relocation we need to visit the JVMTI 66 // export weak roots to rehash the JVMTI tag map 67 ZRelocateRootsIteratorClosure cl; 68 _roots.oops_do(&cl, true /* visit_jvmti_weak_export */); 69 } 70 }; 71 72 void ZRelocate::start() { 73 ZRelocateRootsTask task; 74 _workers->run_parallel(&task); 75 } 76 77 class ZRelocateObjectClosure : public ObjectClosure { 78 private: 79 ZPage* const _page; 80 81 public: 82 ZRelocateObjectClosure(ZPage* page) : 83 _page(page) {} 84 85 virtual void do_object(oop o) { 86 _page->relocate_object(ZOop::to_address(o)); 87 } 88 }; 89 90 bool ZRelocate::work(ZRelocationSetParallelIterator* iter) { 91 bool success = true; 92 93 // Relocate pages in the relocation set 94 for (ZPage* page; iter->next(&page);) { 95 // Relocate objects in page 96 ZRelocateObjectClosure cl(page); 97 page->object_iterate(&cl); 98 99 if (ZVerifyForwarding) { 100 page->verify_forwarding(); 101 } 102 103 if (page->is_pinned()) { 104 // Relocation failed, page is now pinned 105 success = false; 106 } else { 107 // Relocation succeeded, release page 108 ZHeap::heap()->release_page(page, true /* reclaimed */); 109 } 110 } 111 112 return success; 113 } 114 115 class ZRelocateTask : public ZTask { 116 private: 117 ZRelocate* const _relocate; 118 ZRelocationSetParallelIterator _iter; 119 bool _failed; 120 121 public: 122 ZRelocateTask(ZRelocate* relocate, ZRelocationSet* relocation_set) : 123 ZTask("ZRelocateTask"), 124 _relocate(relocate), 125 _iter(relocation_set), 126 _failed(false) {} 127 128 virtual void work() { 129 if (!_relocate->work(&_iter)) { 130 _failed = true; 131 } 132 } 133 134 bool failed() const { 135 return _failed; 136 } 137 }; 138 139 bool ZRelocate::relocate(ZRelocationSet* relocation_set) { 140 ZRelocateTask task(this, relocation_set); 141 _workers->run_concurrent(&task); 142 return !task.failed(); 143 }