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   // Check malloc size, size has to <= MAX_MALLOC_SIZE. This is only possible on 32-bit

   144   // systems, when malloc size >= 1GB, but is is safe to assume it won't happen.

   145   if (size > MAX_MALLOC_SIZE) {

   146     fatal("Should not use malloc for big memory block, use virtual memory instead");

   147   }

   148   // Uses placement global new operator to initialize malloc header

   149   switch(level) {

   150     case NMT_off:

   151       return malloc_base;

   152     case NMT_minimal: {

   153       MallocHeader* hdr = ::new (malloc_base) MallocHeader();

   154       break;

   155     }

   156     case NMT_summary: {

   157       header = ::new (malloc_base) MallocHeader(size, flags);

   158       break;

   159     }

   160     case NMT_detail: {

   161       header = ::new (malloc_base) MallocHeader(size, flags, stack);

   162       break;

   163     }

   164     default:

   165       ShouldNotReachHere();

   166   }

   167   memblock = (void*)((char*)malloc_base + sizeof(MallocHeader));

   168 

   169   // The alignment check: 8 bytes alignment for 32 bit systems.

   170   //                      16 bytes alignment for 64-bit systems.

   171   assert(((size_t)memblock & (sizeof(size_t) * 2 - 1)) == 0, "Alignment check");

   172 

   173   // Sanity check

   174   assert(get_memory_tracking_level(memblock) == level,

   175     "Wrong tracking level");

   176 

   177 #ifdef ASSERT

   178   if (level > NMT_minimal) {

   179     // Read back

   180     assert(get_size(memblock) == size,   "Wrong size");

   181     assert(get_flags(memblock) == flags, "Wrong flags");

   182   }

   183 #endif

   184 

   185   return memblock;

   186 }

   187 

   188 void* MallocTracker::record_free(void* memblock) {

   189   // Never turned on

   190   if (MemTracker::tracking_level() == NMT_off ||

   191       memblock == NULL) {

   192     return memblock;

   193   }

   194   MallocHeader* header = malloc_header(memblock);

   195   header->release();

   196 

   197   return (void*)header;

   198 }

   199 

   200