1 /* 2 * Copyright (c) 2012, 2013, 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 25 #include "precompiled.hpp" 26 27 #include "runtime/atomic.inline.hpp" 28 #include "services/memBaseline.hpp" 29 #include "services/memRecorder.hpp" 30 #include "services/memPtr.hpp" 31 #include "services/memTracker.hpp" 32 33 MemPointer* SequencedRecordIterator::next_record() { 34 MemPointerRecord* itr_cur = (MemPointerRecord*)_itr.current(); 35 if (itr_cur == NULL) { 36 return itr_cur; 37 } 38 39 MemPointerRecord* itr_next = (MemPointerRecord*)_itr.next(); 40 41 // don't collapse virtual memory records 42 while (itr_next != NULL && !itr_cur->is_vm_pointer() && 43 !itr_next->is_vm_pointer() && 44 same_kind(itr_cur, itr_next)) { 45 itr_cur = itr_next; 46 itr_next = (MemPointerRecord*)_itr.next(); 47 } 48 49 return itr_cur; 50 } 51 52 53 volatile jint MemRecorder::_instance_count = 0; 54 55 MemRecorder::MemRecorder() { 56 assert(MemTracker::is_on(), "Native memory tracking is off"); 57 Atomic::inc(&_instance_count); 58 set_generation(); 59 60 if (MemTracker::track_callsite()) { 61 _pointer_records = new (std::nothrow)FixedSizeMemPointerArray<SeqMemPointerRecordEx, 62 DEFAULT_RECORDER_PTR_ARRAY_SIZE>(); 63 } else { 64 _pointer_records = new (std::nothrow)FixedSizeMemPointerArray<SeqMemPointerRecord, 65 DEFAULT_RECORDER_PTR_ARRAY_SIZE>(); 66 } 67 _next = NULL; 68 69 70 if (_pointer_records != NULL) { 71 // recode itself 72 address pc = CURRENT_PC; 73 record((address)this, (MemPointerRecord::malloc_tag()|mtNMT|otNMTRecorder), 74 sizeof(MemRecorder), SequenceGenerator::next(), pc); 75 record((address)_pointer_records, (MemPointerRecord::malloc_tag()|mtNMT|otNMTRecorder), 76 _pointer_records->instance_size(), SequenceGenerator::next(), pc); 77 } 78 } 79 80 MemRecorder::~MemRecorder() { 81 if (_pointer_records != NULL) { 82 if (MemTracker::is_on()) { 83 MemTracker::record_free((address)_pointer_records, mtNMT); 84 MemTracker::record_free((address)this, mtNMT); 85 } 86 delete _pointer_records; 87 } 88 // delete all linked recorders 89 while (_next != NULL) { 90 MemRecorder* tmp = _next; 91 _next = _next->next(); 92 tmp->set_next(NULL); 93 delete tmp; 94 } 95 Atomic::dec(&_instance_count); 96 } 97 98 // Sorting order: 99 // 1. memory block address 100 // 2. mem pointer record tags 101 // 3. sequence number 102 int MemRecorder::sort_record_fn(const void* e1, const void* e2) { 103 const MemPointerRecord* p1 = (const MemPointerRecord*)e1; 104 const MemPointerRecord* p2 = (const MemPointerRecord*)e2; 105 int delta = UNSIGNED_COMPARE(p1->addr(), p2->addr()); 106 if (delta == 0) { 107 int df = UNSIGNED_COMPARE((p1->flags() & MemPointerRecord::tag_masks), 108 (p2->flags() & MemPointerRecord::tag_masks)); 109 if (df == 0) { 110 assert(p1->seq() != p2->seq(), "dup seq"); 111 return p1->seq() - p2->seq(); 112 } else { 113 return df; 114 } 115 } else { 116 return delta; 117 } 118 } 119 120 bool MemRecorder::record(address p, MEMFLAGS flags, size_t size, jint seq, address pc) { 121 assert(seq > 0, "No sequence number"); 122 #ifdef ASSERT 123 if (MemPointerRecord::is_virtual_memory_record(flags)) { 124 assert((flags & MemPointerRecord::tag_masks) != 0, "bad virtual memory record"); 125 } else { 126 assert((flags & MemPointerRecord::tag_masks) == MemPointerRecord::malloc_tag() || 127 (flags & MemPointerRecord::tag_masks) == MemPointerRecord::free_tag() || 128 IS_ARENA_OBJ(flags), 129 "bad malloc record"); 130 } 131 // a recorder should only hold records within the same generation 132 unsigned long cur_generation = SequenceGenerator::current_generation(); 133 assert(cur_generation == _generation, 134 "this thread did not enter sync point"); 135 #endif 136 137 if (MemTracker::track_callsite()) { 138 SeqMemPointerRecordEx ap(p, flags, size, seq, pc); 139 debug_only(check_dup_seq(ap.seq());) 140 return _pointer_records->append(&ap); 141 } else { 142 SeqMemPointerRecord ap(p, flags, size, seq); 143 debug_only(check_dup_seq(ap.seq());) 144 return _pointer_records->append(&ap); 145 } 146 } 147 148 // iterator for alloc pointers 149 SequencedRecordIterator MemRecorder::pointer_itr() { 150 assert(_pointer_records != NULL, "just check"); 151 _pointer_records->sort((FN_SORT)sort_record_fn); 152 return SequencedRecordIterator(_pointer_records); 153 } 154 155 156 void MemRecorder::set_generation() { 157 _generation = SequenceGenerator::current_generation(); 158 } 159 160 #ifdef ASSERT 161 162 void MemRecorder::check_dup_seq(jint seq) const { 163 MemPointerArrayIteratorImpl itr(_pointer_records); 164 MemPointerRecord* rc = (MemPointerRecord*)itr.current(); 165 while (rc != NULL) { 166 assert(rc->seq() != seq, "dup seq"); 167 rc = (MemPointerRecord*)itr.next(); 168 } 169 } 170 171 #endif