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 "utilities/debug.hpp" 29 30 ZPhysicalMemory::ZPhysicalMemory() : 31 _nsegments(0), 32 _segments(NULL) {} 33 34 ZPhysicalMemory::ZPhysicalMemory(size_t size) : 35 _nsegments(0), 36 _segments(NULL) { 37 add_segment(ZPhysicalMemorySegment(0, size)); 38 } 39 40 ZPhysicalMemory::ZPhysicalMemory(const ZPhysicalMemorySegment& segment) : 41 _nsegments(0), 42 _segments(NULL) { 43 add_segment(segment); 44 } 45 46 size_t ZPhysicalMemory::size() const { 47 size_t size = 0; 48 49 for (size_t i = 0; i < _nsegments; i++) { 50 size += _segments[i].size(); 51 } 52 53 return size; 54 } 55 56 void ZPhysicalMemory::add_segment(ZPhysicalMemorySegment segment) { 57 // Try merge with last segment 58 if (_nsegments > 0) { 59 ZPhysicalMemorySegment& last = _segments[_nsegments - 1]; 60 assert(last.end() <= segment.start(), "Segments added out of order"); 61 if (last.end() == segment.start()) { 62 // Merge 63 last.expand(segment.size()); 64 return; 65 } 66 } 67 68 // Make room for a new segment 69 const size_t size = sizeof(ZPhysicalMemorySegment) * (_nsegments + 1); 70 _segments = (ZPhysicalMemorySegment*)ReallocateHeap((char*)_segments, size, mtGC); 71 72 // Add new segment 73 _segments[_nsegments] = segment; 74 _nsegments++; 75 } 76 77 ZPhysicalMemory ZPhysicalMemory::split(size_t split_size) { 78 // Only splitting of single-segment instances have been implemented. 79 assert(nsegments() == 1, "Can only have one segment"); 80 assert(split_size <= size(), "Invalid size"); 81 return ZPhysicalMemory(_segments[0].split(split_size)); 82 } 83 84 void ZPhysicalMemory::clear() { 85 if (_segments != NULL) { 86 FreeHeap(_segments); 87 _segments = NULL; 88 _nsegments = 0; 89 } 90 } 91 92 ZPhysicalMemoryManager::ZPhysicalMemoryManager(size_t max_capacity, size_t granule_size) : 93 _backing(max_capacity, granule_size), 94 _max_capacity(max_capacity), 95 _capacity(0), 96 _used(0) {} 97 98 bool ZPhysicalMemoryManager::is_initialized() const { 99 return _backing.is_initialized(); 100 } 101 102 bool ZPhysicalMemoryManager::ensure_available(size_t size) { 103 const size_t unused_capacity = _capacity - _used; 104 if (unused_capacity >= size) { 105 // Enough unused capacity available 106 return true; 107 } 108 109 const size_t expand_with = size - unused_capacity; 110 const size_t new_capacity = _capacity + expand_with; 111 if (new_capacity > _max_capacity) { 112 // Can not expand beyond max capacity 113 return false; 114 } 115 116 // Expand 117 if (!_backing.expand(_capacity, new_capacity)) { 118 log_error(gc)("Failed to expand Java heap with " SIZE_FORMAT "%s", 119 byte_size_in_proper_unit(expand_with), 120 proper_unit_for_byte_size(expand_with)); 121 return false; 122 } 123 124 _capacity = new_capacity; 125 126 return true; 127 } 128 129 ZPhysicalMemory ZPhysicalMemoryManager::alloc(size_t size) { 130 if (!ensure_available(size)) { 131 // Not enough memory available 132 return ZPhysicalMemory(); 133 } 134 135 _used += size; 136 return _backing.alloc(size); 137 } 138 139 void ZPhysicalMemoryManager::free(ZPhysicalMemory pmem) { 140 _backing.free(pmem); 141 _used -= pmem.size(); 142 } 143 144 void ZPhysicalMemoryManager::map(ZPhysicalMemory pmem, uintptr_t offset) { 145 _backing.map(pmem, offset); 146 } 147 148 void ZPhysicalMemoryManager::unmap(ZPhysicalMemory pmem, uintptr_t offset) { 149 _backing.unmap(pmem, offset); 150 } 151 152 void ZPhysicalMemoryManager::flip(ZPhysicalMemory pmem, uintptr_t offset) { 153 _backing.flip(pmem, offset); 154 }