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
  21  * questions.
  22  *
  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 
  32 size_t MallocMemorySummary::_snapshot[CALC_OBJ_SIZE_IN_TYPE(MallocMemorySnapshot, size_t)];
  33 
  34 // Total malloc'd memory amount
  35 size_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
  45 size_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
  55 void 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 
  62 void 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 
  68 void 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 
  79 bool 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 
  92 bool MallocHeader::get_stack(NativeCallStack& stack) const {
  93   return MallocSiteTable::access_stack(stack, _bucket_idx, _pos_idx);
  94 }
  95 
  96 bool 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 
 107 bool 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
 120 void* 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 
 153 void* 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