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/zGlobals.hpp"

    26 #include "gc/z/zVirtualMemory.inline.hpp"

    27 #include "services/memTracker.hpp"

    28 

    29 ZVirtualMemoryManager::ZVirtualMemoryManager() :

    30     _manager(),

    31     _initialized(false) {

    32   // Reserve address space

    33   if (!reserve(ZAddressSpaceStart, ZAddressSpaceSize)) {

    34     return;

    35   }

    36 

    37   // Make the complete address view free

    38   _manager.free(0, ZAddressOffsetMax);

    39 

    40   // Register address space with native memory tracker

    41   nmt_reserve(ZAddressSpaceStart, ZAddressSpaceSize);

    42 

    43   // Successfully initialized

    44   _initialized = true;

    45 }

    46 

    47 void ZVirtualMemoryManager::nmt_reserve(uintptr_t start, size_t size) {

    48   MemTracker::record_virtual_memory_reserve((void*)start, size, CALLER_PC);

    49   MemTracker::record_virtual_memory_type((void*)start, mtJavaHeap);

    50 }

    51 

    52 bool ZVirtualMemoryManager::is_initialized() const {

    53   return _initialized;

    54 }

    55 

    56 ZVirtualMemory ZVirtualMemoryManager::alloc(size_t size, bool alloc_from_front) {

    57   uintptr_t start;

    58 

    59   if (alloc_from_front || size <= ZPageSizeSmall) {

    60     // Small page

    61     start = _manager.alloc_from_front(size);

    62   } else {

    63     // Medium/Large page

    64     start = _manager.alloc_from_back(size);

    65   }

    66 

    67   return ZVirtualMemory(start, size);

    68 }

    69 

    70 void ZVirtualMemoryManager::free(ZVirtualMemory vmem) {

    71   _manager.free(vmem.start(), vmem.size());

    72 }