1 /* 2 * Copyright (c) 2015, 2019, 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/zAddress.inline.hpp" 26 #include "gc/z/zGlobals.hpp" 27 #include "gc/z/zVirtualMemory.inline.hpp" 28 #include "logging/log.hpp" 29 #include "services/memTracker.hpp" 30 31 bool ZVirtualMemoryManager::reserve_range(uintptr_t start, size_t size) { 32 // Reserve address space 33 char* const marked0_addr = (char*)ZAddress::marked0(start); 34 char* const marked1_addr = (char*)ZAddress::marked1(start); 35 char* const remapped_addr = (char*)ZAddress::remapped(start); 36 37 if (!os::attempt_reserve_memory_at(size, marked0_addr)) { 38 return false; 39 } 40 41 if (!os::attempt_reserve_memory_at(size, marked1_addr)) { 42 os::release_memory(marked0_addr, size); 43 return false; 44 } 45 46 if (!os::attempt_reserve_memory_at(size, remapped_addr)) { 47 os::release_memory(marked0_addr, size); 48 os::release_memory(marked1_addr, size); 49 return false; 50 } 51 52 // Make the address view free 53 _manager.free(start, size); 54 return true; 55 } 56 57 size_t ZVirtualMemoryManager::reserve(uintptr_t start, size_t size) { 58 if (reserve_range(start, size)) { 59 return size; 60 } 61 62 if (size <= ZGranuleSize) { 63 return 0; 64 } 65 66 const size_t range = size / 2; 67 return reserve(start, range) + reserve(start + range, range); 68 } 69 70 ZVirtualMemoryManager::ZVirtualMemoryManager() : 71 _manager(), 72 _initialized(false) { 73 74 log_info(gc, init)("Address Space: " PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "T)", 75 ZAddressSpaceStart, ZAddressSpaceEnd, ZAddressSpaceSize / K / G); 76 77 // Reserve address space 78 if (reserve(0, ZAddressOffsetMax) < MaxHeapSize) { 79 log_error(gc)("Failed to reserve enough address space for Java heap"); 80 return; 81 } 82 83 // Successfully initialized 84 _initialized = true; 85 } 86 87 bool ZVirtualMemoryManager::is_initialized() const { 88 return _initialized; 89 } 90 91 ZVirtualMemory ZVirtualMemoryManager::alloc(size_t size, bool alloc_from_front) { 92 uintptr_t start; 93 94 if (alloc_from_front || size <= ZPageSizeSmall) { 95 // Small page 96 start = _manager.alloc_from_front(size); 97 } else { 98 // Medium/Large page 99 start = _manager.alloc_from_back(size); 100 } 101 102 return ZVirtualMemory(start, size); 103 } 104 105 void ZVirtualMemoryManager::free(const ZVirtualMemory& vmem) { 106 _manager.free(vmem.start(), vmem.size()); 107 }