1 /* 2 * Copyright (c) 2014, 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 26 #include "runtime/atomic.hpp" 27 #include "runtime/atomic.inline.hpp" 28 #include "services/mallocSiteTable.hpp" 29 #include "services/mallocTracker.hpp" 30 #include "services/mallocTracker.inline.hpp" 31 #include "services/memTracker.hpp" 32 33 size_t MallocMemorySummary::_snapshot[CALC_OBJ_SIZE_IN_TYPE(MallocMemorySnapshot, size_t)]; 34 35 // Total malloc'd memory amount 36 size_t MallocMemorySnapshot::total() const { 37 size_t amount = 0; 38 for (int index = 0; index < mt_number_of_types; index ++) { 39 amount += _malloc[index].malloc_size(); 40 } 41 amount += _tracking_header.size() + total_arena(); 42 return amount; 43 } 44 45 // Total malloc'd memory used by arenas 46 size_t MallocMemorySnapshot::total_arena() const { 47 size_t amount = 0; 48 for (int index = 0; index < mt_number_of_types; index ++) { 49 amount += _malloc[index].arena_size(); 50 } 51 return amount; 52 } 53 54 // Make adjustment by subtracting chunks used by arenas 55 // from total chunks to get total free chunk size 56 void MallocMemorySnapshot::make_adjustment() { 57 size_t arena_size = total_arena(); 58 int chunk_idx = NMTUtil::flag_to_index(mtChunk); 59 _malloc[chunk_idx].record_free(arena_size); 60 } 61 62 63 void MallocMemorySummary::initialize() { 64 assert(sizeof(_snapshot) >= sizeof(MallocMemorySnapshot), "Sanity Check"); 65 // Uses placement new operator to initialize static area. 66 ::new ((void*)_snapshot)MallocMemorySnapshot(); 67 } 68 69 void MallocHeader::release() const { 70 // Tracking already shutdown, no housekeeping is needed anymore 71 if (MemTracker::tracking_level() <= NMT_minimal) return; 72 73 MallocMemorySummary::record_free(size(), flags()); 74 MallocMemorySummary::record_free_malloc_header(sizeof(MallocHeader)); 75 if (MemTracker::tracking_level() == NMT_detail) { 76 MallocSiteTable::deallocation_at(size(), _bucket_idx, _pos_idx); 77 } 78 } 79 80 bool MallocHeader::record_malloc_site(const NativeCallStack& stack, size_t size, 81 size_t* bucket_idx, size_t* pos_idx) const { 82 bool ret = MallocSiteTable::allocation_at(stack, size, bucket_idx, pos_idx); 83 84 // Something went wrong, could be OOM or overflow malloc site table. 85 // We want to keep tracking data under OOM circumstance, so transition to 86 // summary tracking. 87 if (!ret) { 88 MemTracker::transition_to(NMT_summary); 89 } 90 return ret; 91 } 92 93 bool MallocHeader::get_stack(NativeCallStack& stack) const { 94 return MallocSiteTable::access_stack(stack, _bucket_idx, _pos_idx); 95 } 96 97 bool MallocTracker::initialize(NMT_TrackingLevel level) { 98 if (level >= NMT_summary) { 99 MallocMemorySummary::initialize(); 100 } 101 102 if (level == NMT_detail) { 103 return MallocSiteTable::initialize(); 104 } 105 return true; 106 } 107 108 bool MallocTracker::transition(NMT_TrackingLevel from, NMT_TrackingLevel to) { 109 assert(from != NMT_off, "Can not transition from off state"); 110 assert(to != NMT_off, "Can not transition to off state"); 111 assert (from != NMT_minimal, "cannot transition from minimal state"); 112 113 if (from == NMT_detail) { 114 assert(to == NMT_minimal || to == NMT_summary, "Just check"); 115 MallocSiteTable::shutdown(); 116 } 117 return true; 118 } 119 120 // Record a malloc memory allocation 121 void* MallocTracker::record_malloc(void* malloc_base, size_t size, MEMFLAGS flags, 122 const NativeCallStack& stack, NMT_TrackingLevel level) { 123 void* memblock; // the address for user data 124 MallocHeader* header = NULL; 125 126 if (malloc_base == NULL) { 127 return NULL; 128 } 129 130 // Uses placement global new operator to initialize malloc header 131 132 if (level == NMT_off) { 133 return malloc_base; 134 } 135 136 header = ::new (malloc_base)MallocHeader(size, flags, stack, level); 137 memblock = (void*)((char*)malloc_base + sizeof(MallocHeader)); 138 139 // The alignment check: 8 bytes alignment for 32 bit systems. 140 // 16 bytes alignment for 64-bit systems. 141 assert(((size_t)memblock & (sizeof(size_t) * 2 - 1)) == 0, "Alignment check"); 142 143 #ifdef ASSERT 144 if (level > NMT_minimal) { 145 // Read back 146 assert(get_size(memblock) == size, "Wrong size"); 147 assert(get_flags(memblock) == flags, "Wrong flags"); 148 } 149 #endif 150 151 return memblock; 152 } 153 154 void* MallocTracker::record_free(void* memblock) { 155 // Never turned on 156 if (MemTracker::tracking_level() == NMT_off || 157 memblock == NULL) { 158 return memblock; 159 } 160 MallocHeader* header = malloc_header(memblock); 161 header->release(); 162 163 return (void*)header; 164 } 165 166