1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/services/mallocTracker.cpp Wed Aug 27 08:19:12 2014 -0400
1.3 @@ -0,0 +1,200 @@
1.4 +/*
1.5 + * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +#include "precompiled.hpp"
1.28 +
1.29 +#include "runtime/atomic.hpp"
1.30 +#include "runtime/atomic.inline.hpp"
1.31 +#include "services/mallocSiteTable.hpp"
1.32 +#include "services/mallocTracker.hpp"
1.33 +#include "services/mallocTracker.inline.hpp"
1.34 +#include "services/memTracker.hpp"
1.35 +
1.36 +size_t MallocMemorySummary::_snapshot[CALC_OBJ_SIZE_IN_TYPE(MallocMemorySnapshot, size_t)];
1.37 +
1.38 +// Total malloc'd memory amount
1.39 +size_t MallocMemorySnapshot::total() const {
1.40 + size_t amount = 0;
1.41 + for (int index = 0; index < mt_number_of_types; index ++) {
1.42 + amount += _malloc[index].malloc_size();
1.43 + }
1.44 + amount += _tracking_header.size() + total_arena();
1.45 + return amount;
1.46 +}
1.47 +
1.48 +// Total malloc'd memory used by arenas
1.49 +size_t MallocMemorySnapshot::total_arena() const {
1.50 + size_t amount = 0;
1.51 + for (int index = 0; index < mt_number_of_types; index ++) {
1.52 + amount += _malloc[index].arena_size();
1.53 + }
1.54 + return amount;
1.55 +}
1.56 +
1.57 +
1.58 +void MallocMemorySnapshot::reset() {
1.59 + _tracking_header.reset();
1.60 + for (int index = 0; index < mt_number_of_types; index ++) {
1.61 + _malloc[index].reset();
1.62 + }
1.63 +}
1.64 +
1.65 +// Make adjustment by subtracting chunks used by arenas
1.66 +// from total chunks to get total free chunck size
1.67 +void MallocMemorySnapshot::make_adjustment() {
1.68 + size_t arena_size = total_arena();
1.69 + int chunk_idx = NMTUtil::flag_to_index(mtChunk);
1.70 + _malloc[chunk_idx].record_free(arena_size);
1.71 +}
1.72 +
1.73 +
1.74 +void MallocMemorySummary::initialize() {
1.75 + assert(sizeof(_snapshot) >= sizeof(MallocMemorySnapshot), "Sanity Check");
1.76 + // Uses placement new operator to initialize static area.
1.77 + ::new ((void*)_snapshot)MallocMemorySnapshot();
1.78 +}
1.79 +
1.80 +void MallocHeader::release() const {
1.81 + // Tracking already shutdown, no housekeeping is needed anymore
1.82 + if (MemTracker::tracking_level() <= NMT_minimal) return;
1.83 +
1.84 + MallocMemorySummary::record_free(size(), flags());
1.85 + MallocMemorySummary::record_free_malloc_header(sizeof(MallocHeader));
1.86 + if (tracking_level() == NMT_detail) {
1.87 + MallocSiteTable::deallocation_at(size(), _bucket_idx, _pos_idx);
1.88 + }
1.89 +}
1.90 +
1.91 +bool MallocHeader::record_malloc_site(const NativeCallStack& stack, size_t size,
1.92 + size_t* bucket_idx, size_t* pos_idx) const {
1.93 + bool ret = MallocSiteTable::allocation_at(stack, size, bucket_idx, pos_idx);
1.94 +
1.95 + // Something went wrong, could be OOM or overflow malloc site table.
1.96 + // We want to keep tracking data under OOM circumstance, so transition to
1.97 + // summary tracking.
1.98 + if (!ret) {
1.99 + MemTracker::transition_to(NMT_summary);
1.100 + }
1.101 + return ret;
1.102 +}
1.103 +
1.104 +bool MallocHeader::get_stack(NativeCallStack& stack) const {
1.105 + return MallocSiteTable::access_stack(stack, _bucket_idx, _pos_idx);
1.106 +}
1.107 +
1.108 +bool MallocTracker::initialize(NMT_TrackingLevel level) {
1.109 + if (level >= NMT_summary) {
1.110 + MallocMemorySummary::initialize();
1.111 + }
1.112 +
1.113 + if (level == NMT_detail) {
1.114 + return MallocSiteTable::initialize();
1.115 + }
1.116 + return true;
1.117 +}
1.118 +
1.119 +bool MallocTracker::transition(NMT_TrackingLevel from, NMT_TrackingLevel to) {
1.120 + assert(from != NMT_off, "Can not transition from off state");
1.121 + assert(to != NMT_off, "Can not transition to off state");
1.122 + if (from == NMT_minimal) {
1.123 + MallocMemorySummary::reset();
1.124 + }
1.125 +
1.126 + if (to == NMT_detail) {
1.127 + assert(from == NMT_minimal || from == NMT_summary, "Just check");
1.128 + return MallocSiteTable::initialize();
1.129 + } else if (from == NMT_detail) {
1.130 + assert(to == NMT_minimal || to == NMT_summary, "Just check");
1.131 + MallocSiteTable::shutdown();
1.132 + }
1.133 + return true;
1.134 +}
1.135 +
1.136 +// Record a malloc memory allocation
1.137 +void* MallocTracker::record_malloc(void* malloc_base, size_t size, MEMFLAGS flags,
1.138 + const NativeCallStack& stack, NMT_TrackingLevel level) {
1.139 + void* memblock; // the address for user data
1.140 + MallocHeader* header = NULL;
1.141 +
1.142 + if (malloc_base == NULL) {
1.143 + return NULL;
1.144 + }
1.145 +
1.146 + // Check malloc size, size has to <= MAX_MALLOC_SIZE. This is only possible on 32-bit
1.147 + // systems, when malloc size >= 1GB, but is is safe to assume it won't happen.
1.148 + if (size > MAX_MALLOC_SIZE) {
1.149 + fatal("Should not use malloc for big memory block, use virtual memory instead");
1.150 + }
1.151 + // Uses placement global new operator to initialize malloc header
1.152 + switch(level) {
1.153 + case NMT_off:
1.154 + return malloc_base;
1.155 + case NMT_minimal: {
1.156 + MallocHeader* hdr = ::new (malloc_base) MallocHeader();
1.157 + break;
1.158 + }
1.159 + case NMT_summary: {
1.160 + header = ::new (malloc_base) MallocHeader(size, flags);
1.161 + break;
1.162 + }
1.163 + case NMT_detail: {
1.164 + header = ::new (malloc_base) MallocHeader(size, flags, stack);
1.165 + break;
1.166 + }
1.167 + default:
1.168 + ShouldNotReachHere();
1.169 + }
1.170 + memblock = (void*)((char*)malloc_base + sizeof(MallocHeader));
1.171 +
1.172 + // The alignment check: 8 bytes alignment for 32 bit systems.
1.173 + // 16 bytes alignment for 64-bit systems.
1.174 + assert(((size_t)memblock & (sizeof(size_t) * 2 - 1)) == 0, "Alignment check");
1.175 +
1.176 + // Sanity check
1.177 + assert(get_memory_tracking_level(memblock) == level,
1.178 + "Wrong tracking level");
1.179 +
1.180 +#ifdef ASSERT
1.181 + if (level > NMT_minimal) {
1.182 + // Read back
1.183 + assert(get_size(memblock) == size, "Wrong size");
1.184 + assert(get_flags(memblock) == flags, "Wrong flags");
1.185 + }
1.186 +#endif
1.187 +
1.188 + return memblock;
1.189 +}
1.190 +
1.191 +void* MallocTracker::record_free(void* memblock) {
1.192 + // Never turned on
1.193 + if (MemTracker::tracking_level() == NMT_off ||
1.194 + memblock == NULL) {
1.195 + return memblock;
1.196 + }
1.197 + MallocHeader* header = malloc_header(memblock);
1.198 + header->release();
1.199 +
1.200 + return (void*)header;
1.201 +}
1.202 +
1.203 +
