1 /*

     2  * Copyright (c) 2015, 2017, 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 #include "gc/z/zPhysicalMemory.inline.hpp"

    26 #include "logging/log.hpp"

    27 #include "memory/allocation.inline.hpp"

    28 #include "services/memTracker.hpp"

    29 #include "utilities/debug.hpp"

    30 

    31 ZPhysicalMemory::ZPhysicalMemory() :

    32     _nsegments(0),

    33     _segments(NULL) {}

    34 

    35 ZPhysicalMemory::ZPhysicalMemory(size_t size) :

    36     _nsegments(0),

    37     _segments(NULL) {

    38   add_segment(ZPhysicalMemorySegment(0, size));

    39 }

    40 

    41 ZPhysicalMemory::ZPhysicalMemory(const ZPhysicalMemorySegment& segment) :

    42     _nsegments(0),

    43     _segments(NULL) {

    44   add_segment(segment);

    45 }

    46 

    47 size_t ZPhysicalMemory::size() const {

    48   size_t size = 0;

    49 

    50   for (size_t i = 0; i < _nsegments; i++) {

    51     size += _segments[i].size();

    52   }

    53 

    54   return size;

    55 }

    56 

    57 void ZPhysicalMemory::add_segment(ZPhysicalMemorySegment segment) {

    58   // Try merge with last segment

    59   if (_nsegments > 0) {

    60     ZPhysicalMemorySegment& last = _segments[_nsegments - 1];

    61     assert(last.end() <= segment.start(), "Segments added out of order");

    62     if (last.end() == segment.start()) {

    63       // Merge

    64       last.expand(segment.size());

    65       return;

    66     }

    67   }

    68 

    69   // Make room for a new segment

    70   const size_t size = sizeof(ZPhysicalMemorySegment) * (_nsegments + 1);

    71   _segments = (ZPhysicalMemorySegment*)ReallocateHeap((char*)_segments, size, mtGC);

    72 

    73   // Add new segment

    74   _segments[_nsegments] = segment;

    75   _nsegments++;

    76 }

    77 

    78 ZPhysicalMemory ZPhysicalMemory::split(size_t split_size) {

    79   // Only splitting of single-segment instances have been implemented.

    80   assert(nsegments() == 1, "Can only have one segment");

    81   assert(split_size <= size(), "Invalid size");

    82   return ZPhysicalMemory(_segments[0].split(split_size));

    83 }

    84 

    85 void ZPhysicalMemory::clear() {

    86   if (_segments != NULL) {

    87     FreeHeap(_segments);

    88     _segments = NULL;

    89     _nsegments = 0;

    90   }

    91 }

    92 

    93 ZPhysicalMemoryManager::ZPhysicalMemoryManager(size_t max_capacity, size_t granule_size) :

    94     _backing(max_capacity, granule_size),

    95     _max_capacity(max_capacity),

    96     _capacity(0),

    97     _used(0) {}

    98 

    99 bool ZPhysicalMemoryManager::is_initialized() const {

   100   return _backing.is_initialized();

   101 }

   102 

   103 bool ZPhysicalMemoryManager::ensure_available(size_t size) {

   104   const size_t unused_capacity = _capacity - _used;

   105   if (unused_capacity >= size) {

   106     // Enough unused capacity available

   107     return true;

   108   }

   109 

   110   const size_t expand_with = size - unused_capacity;

   111   const size_t new_capacity = _capacity + expand_with;

   112   if (new_capacity > _max_capacity) {

   113     // Can not expand beyond max capacity

   114     return false;

   115   }

   116 

   117   // Expand

   118   if (!_backing.expand(_capacity, new_capacity)) {

   119     log_error(gc)("Failed to expand Java heap with " SIZE_FORMAT "%s",

   120                   byte_size_in_proper_unit(expand_with),

   121                   proper_unit_for_byte_size(expand_with));

   122     return false;

   123   }

   124 

   125   _capacity = new_capacity;

   126 

   127   return true;

   128 }

   129 

   130 void ZPhysicalMemoryManager::nmt_commit(ZPhysicalMemory pmem, uintptr_t offset) {

   131   const uintptr_t addr = _backing.nmt_address(offset);

   132   const size_t size = pmem.size();

   133   MemTracker::record_virtual_memory_commit((void*)addr, size, CALLER_PC);

   134 }

   135 

   136 void ZPhysicalMemoryManager::nmt_uncommit(ZPhysicalMemory pmem, uintptr_t offset) {

   137   if (MemTracker::tracking_level() > NMT_minimal) {

   138     const uintptr_t addr = _backing.nmt_address(offset);

   139     const size_t size = pmem.size();

   140 

   141     Tracker tracker(Tracker::uncommit);

   142     tracker.record((address)addr, size);

   143   }

   144 }

   145 

   146 ZPhysicalMemory ZPhysicalMemoryManager::alloc(size_t size) {

   147   if (!ensure_available(size)) {

   148     // Not enough memory available

   149     return ZPhysicalMemory();

   150   }

   151 

   152   _used += size;

   153   return _backing.alloc(size);

   154 }

   155 

   156 void ZPhysicalMemoryManager::free(ZPhysicalMemory pmem) {

   157   _backing.free(pmem);

   158   _used -= pmem.size();

   159 }

   160 

   161 void ZPhysicalMemoryManager::map(ZPhysicalMemory pmem, uintptr_t offset) {

   162   // Map page

   163   _backing.map(pmem, offset);

   164 

   165   // Update native memory tracker

   166   nmt_commit(pmem, offset);

   167 }

   168 

   169 void ZPhysicalMemoryManager::unmap(ZPhysicalMemory pmem, uintptr_t offset) {

   170   // Update native memory tracker

   171   nmt_uncommit(pmem, offset);

   172 

   173   // Unmap page

   174   _backing.unmap(pmem, offset);

   175 }

   176 

   177 void ZPhysicalMemoryManager::flip(ZPhysicalMemory pmem, uintptr_t offset) {

   178   _backing.flip(pmem, offset);

   179 }