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 }