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
55 void MallocMemorySnapshot::reset() {
56 _tracking_header.reset();
57 for (int index = 0; index < mt_number_of_types; index ++) {
58 _malloc[index].reset();
59 }
60 }
61
62 // Make adjustment by subtracting chunks used by arenas
63 // from total chunks to get total free chunck size
64 void MallocMemorySnapshot::make_adjustment() {
65 size_t arena_size = total_arena();
66 int chunk_idx = NMTUtil::flag_to_index(mtChunk);
67 _malloc[chunk_idx].record_free(arena_size);
68 }
69
70
71 void MallocMemorySummary::initialize() {
72 assert(sizeof(_snapshot) >= sizeof(MallocMemorySnapshot), "Sanity Check");
73 // Uses placement new operator to initialize static area.
74 ::new ((void*)_snapshot)MallocMemorySnapshot();
75 }
76
77 void MallocHeader::release() const {
78 // Tracking already shutdown, no housekeeping is needed anymore
79 if (MemTracker::tracking_level() <= NMT_minimal) return;
80
81 MallocMemorySummary::record_free(size(), flags());
82 MallocMemorySummary::record_free_malloc_header(sizeof(MallocHeader));
83 if (tracking_level() == NMT_detail) {
84 MallocSiteTable::deallocation_at(size(), _bucket_idx, _pos_idx);
85 }
86 }
87
88 bool MallocHeader::record_malloc_site(const NativeCallStack& stack, size_t size,
89 size_t* bucket_idx, size_t* pos_idx) const {
90 bool ret = MallocSiteTable::allocation_at(stack, size, bucket_idx, pos_idx);
91
92 // Something went wrong, could be OOM or overflow malloc site table.
93 // We want to keep tracking data under OOM circumstance, so transition to
94 // summary tracking.
95 if (!ret) {
96 MemTracker::transition_to(NMT_summary);
97 }
98 return ret;
99 }
100
101 bool MallocHeader::get_stack(NativeCallStack& stack) const {
102 return MallocSiteTable::access_stack(stack, _bucket_idx, _pos_idx);
103 }
104
105 bool MallocTracker::initialize(NMT_TrackingLevel level) {
106 if (level >= NMT_summary) {
107 MallocMemorySummary::initialize();
108 }
109
110 if (level == NMT_detail) {
111 return MallocSiteTable::initialize();
112 }
113 return true;
114 }
115
116 bool MallocTracker::transition(NMT_TrackingLevel from, NMT_TrackingLevel to) {
117 assert(from != NMT_off, "Can not transition from off state");
118 assert(to != NMT_off, "Can not transition to off state");
119 if (from == NMT_minimal) {
120 MallocMemorySummary::reset();
121 }
122
123 if (to == NMT_detail) {
124 assert(from == NMT_minimal || from == NMT_summary, "Just check");
125 return MallocSiteTable::initialize();
126 } else if (from == NMT_detail) {
127 assert(to == NMT_minimal || to == NMT_summary, "Just check");
128 MallocSiteTable::shutdown();
129 }
130 return true;
131 }
132
133 // Record a malloc memory allocation
134 void* MallocTracker::record_malloc(void* malloc_base, size_t size, MEMFLAGS flags,
135 const NativeCallStack& stack, NMT_TrackingLevel level) {
136 void* memblock; // the address for user data
137 MallocHeader* header = NULL;
138
139 if (malloc_base == NULL) {
140 return NULL;
141 }
142
143 // Uses placement global new operator to initialize malloc header
144 switch(level) {
145 case NMT_off:
146 return malloc_base;
147 case NMT_minimal: {
148 MallocHeader* hdr = ::new (malloc_base) MallocHeader();
149 break;
150 }
151 case NMT_summary: {
152 assert(size <= MAX_MALLOC_SIZE, "malloc size overrun for NMT");
153 header = ::new (malloc_base) MallocHeader(size, flags);
154 break;
155 }
156 case NMT_detail: {
157 assert(size <= MAX_MALLOC_SIZE, "malloc size overrun for NMT");
158 header = ::new (malloc_base) MallocHeader(size, flags, stack);
159 break;
160 }
161 default:
162 ShouldNotReachHere();
163 }
164 memblock = (void*)((char*)malloc_base + sizeof(MallocHeader));
165
166 // The alignment check: 8 bytes alignment for 32 bit systems.
167 // 16 bytes alignment for 64-bit systems.
168 assert(((size_t)memblock & (sizeof(size_t) * 2 - 1)) == 0, "Alignment check");
169
170 // Sanity check
171 assert(get_memory_tracking_level(memblock) == level,
172 "Wrong tracking level");
173
174 #ifdef ASSERT
175 if (level > NMT_minimal) {
176 // Read back
177 assert(get_size(memblock) == size, "Wrong size");
178 assert(get_flags(memblock) == flags, "Wrong flags");
179 }
180 #endif
181
182 return memblock;
183 }
184
185 void* MallocTracker::record_free(void* memblock) {
186 // Never turned on
187 if (MemTracker::tracking_level() == NMT_off ||
188 memblock == NULL) {
189 return memblock;
190 }
191 MallocHeader* header = malloc_header(memblock);
192 header->release();
193
194 return (void*)header;
195 }
196
197