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 chunck 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 (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 switch(level) {
132 case NMT_off:
133 return malloc_base;
134 case NMT_minimal: {
135 MallocHeader* hdr = ::new (malloc_base) MallocHeader();
136 break;
137 }
138 case NMT_summary: {
139 assert(size <= MAX_MALLOC_SIZE, "malloc size overrun for NMT");
140 header = ::new (malloc_base) MallocHeader(size, flags);
141 break;
142 }
143 case NMT_detail: {
144 assert(size <= MAX_MALLOC_SIZE, "malloc size overrun for NMT");
145 header = ::new (malloc_base) MallocHeader(size, flags, stack);
146 break;
147 }
148 default:
149 ShouldNotReachHere();
150 }
151 memblock = (void*)((char*)malloc_base + sizeof(MallocHeader));
152
153 // The alignment check: 8 bytes alignment for 32 bit systems.
154 // 16 bytes alignment for 64-bit systems.
155 assert(((size_t)memblock & (sizeof(size_t) * 2 - 1)) == 0, "Alignment check");
156
157 // Sanity check
158 assert(get_memory_tracking_level(memblock) == level,
159 "Wrong tracking level");
160
161 #ifdef ASSERT
162 if (level > NMT_minimal) {
163 // Read back
164 assert(get_size(memblock) == size, "Wrong size");
165 assert(get_flags(memblock) == flags, "Wrong flags");
166 }
167 #endif
168
169 return memblock;
170 }
171
172 void* MallocTracker::record_free(void* memblock) {
173 // Never turned on
174 if (MemTracker::tracking_level() == NMT_off ||
175 memblock == NULL) {
176 return memblock;
177 }
178 MallocHeader* header = malloc_header(memblock);
179 header->release();
180
181 return (void*)header;
182 }
183
184