mallocTracker.cpp revision 11857:d0fbf661cc16 
1/*
2 * Copyright (c) 2014, 2016, 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
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23 */
24#include "precompiled.hpp"
25
26#include "runtime/atomic.hpp"
27#include "services/mallocSiteTable.hpp"
28#include "services/mallocTracker.hpp"
29#include "services/mallocTracker.inline.hpp"
30#include "services/memTracker.hpp"
31
32size_t MallocMemorySummary::_snapshot[CALC_OBJ_SIZE_IN_TYPE(MallocMemorySnapshot, size_t)];
33
34// Total malloc'd memory amount
35size_t MallocMemorySnapshot::total() const {
36  size_t amount = 0;
37  for (int index = 0; index < mt_number_of_types; index ++) {
38    amount += _malloc[index].malloc_size();
39  }
40  amount += _tracking_header.size() + total_arena();
41  return amount;
42}
43
44// Total malloc'd memory used by arenas
45size_t MallocMemorySnapshot::total_arena() const {
46  size_t amount = 0;
47  for (int index = 0; index < mt_number_of_types; index ++) {
48    amount += _malloc[index].arena_size();
49  }
50  return amount;
51}
52
53// Make adjustment by subtracting chunks used by arenas
54// from total chunks to get total free chunk size
55void MallocMemorySnapshot::make_adjustment() {
56  size_t arena_size = total_arena();
57  int chunk_idx = NMTUtil::flag_to_index(mtChunk);
58  _malloc[chunk_idx].record_free(arena_size);
59}
60
61
62void MallocMemorySummary::initialize() {
63  assert(sizeof(_snapshot) >= sizeof(MallocMemorySnapshot), "Sanity Check");
64  // Uses placement new operator to initialize static area.
65  ::new ((void*)_snapshot)MallocMemorySnapshot();
66}
67
68void MallocHeader::release() const {
69  // Tracking already shutdown, no housekeeping is needed anymore
70  if (MemTracker::tracking_level() <= NMT_minimal) return;
71
72  MallocMemorySummary::record_free(size(), flags());
73  MallocMemorySummary::record_free_malloc_header(sizeof(MallocHeader));
74  if (MemTracker::tracking_level() == NMT_detail) {
75    MallocSiteTable::deallocation_at(size(), _bucket_idx, _pos_idx);
76  }
77}
78
79bool MallocHeader::record_malloc_site(const NativeCallStack& stack, size_t size,
80  size_t* bucket_idx, size_t* pos_idx) const {
81  bool ret =  MallocSiteTable::allocation_at(stack, size, bucket_idx, pos_idx);
82
83  // Something went wrong, could be OOM or overflow malloc site table.
84  // We want to keep tracking data under OOM circumstance, so transition to
85  // summary tracking.
86  if (!ret) {
87    MemTracker::transition_to(NMT_summary);
88  }
89  return ret;
90}
91
92bool MallocHeader::get_stack(NativeCallStack& stack) const {
93  return MallocSiteTable::access_stack(stack, _bucket_idx, _pos_idx);
94}
95
96bool MallocTracker::initialize(NMT_TrackingLevel level) {
97  if (level >= NMT_summary) {
98    MallocMemorySummary::initialize();
99  }
100
101  if (level == NMT_detail) {
102    return MallocSiteTable::initialize();
103  }
104  return true;
105}
106
107bool MallocTracker::transition(NMT_TrackingLevel from, NMT_TrackingLevel to) {
108  assert(from != NMT_off, "Can not transition from off state");
109  assert(to != NMT_off, "Can not transition to off state");
110  assert (from != NMT_minimal, "cannot transition from minimal state");
111
112  if (from == NMT_detail) {
113    assert(to == NMT_minimal || to == NMT_summary, "Just check");
114    MallocSiteTable::shutdown();
115  }
116  return true;
117}
118
119// Record a malloc memory allocation
120void* MallocTracker::record_malloc(void* malloc_base, size_t size, MEMFLAGS flags,
121  const NativeCallStack& stack, NMT_TrackingLevel level) {
122  void*         memblock;      // the address for user data
123  MallocHeader* header = NULL;
124
125  if (malloc_base == NULL) {
126    return NULL;
127  }
128
129  // Uses placement global new operator to initialize malloc header
130
131  if (level == NMT_off) {
132    return malloc_base;
133  }
134
135  header = ::new (malloc_base)MallocHeader(size, flags, stack, level);
136  memblock = (void*)((char*)malloc_base + sizeof(MallocHeader));
137
138  // The alignment check: 8 bytes alignment for 32 bit systems.
139  //                      16 bytes alignment for 64-bit systems.
140  assert(((size_t)memblock & (sizeof(size_t) * 2 - 1)) == 0, "Alignment check");
141
142#ifdef ASSERT
143  if (level > NMT_minimal) {
144    // Read back
145    assert(get_size(memblock) == size,   "Wrong size");
146    assert(get_flags(memblock) == flags, "Wrong flags");
147  }
148#endif
149
150  return memblock;
151}
152
153void* MallocTracker::record_free(void* memblock) {
154  // Never turned on
155  if (MemTracker::tracking_level() == NMT_off ||
156      memblock == NULL) {
157    return memblock;
158  }
159  MallocHeader* header = malloc_header(memblock);
160  header->release();
161
162  return (void*)header;
163}
164
165
166