1 /* 2 * Copyright (c) 1997, 2018, 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 25 #ifndef SHARE_VM_RUNTIME_VIRTUALSPACE_HPP 26 #define SHARE_VM_RUNTIME_VIRTUALSPACE_HPP 27 28 #include "utilities/globalDefinitions.hpp" 29 30 // ReservedSpace is a data structure for reserving a contiguous address range. 31 32 class ReservedSpace { 33 friend class VMStructs; 34 protected: 35 char* _base; 36 char* _nvdimm_base; 37 char* _nvdimm_base_nv; 38 size_t _size; 39 size_t _dram_size; 40 size_t _nvdimm_size; 41 size_t _noaccess_prefix; 42 size_t _alignment; 43 bool _special; 44 int _fd_for_heap; 45 private: 46 bool _executable; 47 48 // ReservedSpace 49 ReservedSpace(char* base, size_t size, size_t alignment, bool special, 50 bool executable); 51 protected: 52 void initialize(size_t size, size_t alignment, bool large, 53 char* requested_address, 54 bool executable); 55 56 public: 57 // Constructor 58 ReservedSpace(); 59 // Initialize the reserved space with the given size. If preferred_page_size 60 // is set, use this as minimum page size/alignment. This may waste some space 61 // if the given size is not aligned to that value, as the reservation will be 62 // aligned up to the final alignment in this case. 63 ReservedSpace(size_t size, size_t preferred_page_size = 0); 64 ReservedSpace(size_t size, size_t alignment, bool large, 65 char* requested_address = NULL); 66 ReservedSpace(size_t size, size_t alignment, bool large, bool executable); 67 68 // Accessors 69 char* base() const { return _base; } 70 char* nvdimm_base() const { return _nvdimm_base; } 71 int nvdimm_fd() const { return _fd_for_heap; } 72 void setup_fd(int fd) {_fd_for_heap = fd; } 73 size_t size() const { return _size; } 74 size_t nvdimm_size() const { return _nvdimm_size; } 75 char* end() const { return _base + _size; } 76 size_t alignment() const { return _alignment; } 77 bool special() const { return _special; } 78 bool executable() const { return _executable; } 79 size_t noaccess_prefix() const { return _noaccess_prefix; } 80 bool is_reserved() const { return _base != NULL; } 81 void release(); 82 83 // Splitting 84 ReservedSpace first_part(size_t partition_size, size_t alignment, 85 bool split = false, bool realloc = true); 86 ReservedSpace last_part (size_t partition_size, size_t alignment); 87 88 // These simply call the above using the default alignment. 89 inline ReservedSpace first_part(size_t partition_size, 90 bool split = false, bool realloc = true); 91 inline ReservedSpace last_part (size_t partition_size); 92 93 // Alignment 94 static size_t page_align_size_up(size_t size); 95 static size_t page_align_size_down(size_t size); 96 static size_t allocation_align_size_up(size_t size); 97 static size_t allocation_align_size_down(size_t size); 98 bool contains(const void* p) const { 99 return (base() <= ((char*)p)) && (((char*)p) < (base() + size())); 100 } 101 }; 102 103 ReservedSpace 104 ReservedSpace::first_part(size_t partition_size, bool split, bool realloc) 105 { 106 return first_part(partition_size, alignment(), split, realloc); 107 } 108 109 ReservedSpace ReservedSpace::last_part(size_t partition_size) 110 { 111 return last_part(partition_size, alignment()); 112 } 113 114 // Class encapsulating behavior specific of memory space reserved for Java heap. 115 class ReservedHeapSpace : public ReservedSpace { 116 private: 117 void try_reserve_heap(size_t size, size_t alignment, bool large, 118 char *requested_address); 119 void try_reserve_range(char *highest_start, char *lowest_start, 120 size_t attach_point_alignment, char *aligned_HBMA, 121 char *upper_bound, size_t size, size_t alignment, bool large); 122 void initialize_compressed_heap(const size_t size, size_t alignment, bool large); 123 // Create protection page at the beginning of the space. 124 void establish_noaccess_prefix(); 125 void initialize_g1gc_nvdimm_dram_sizes(size_t size, size_t alignment); 126 public: 127 // Constructor. Tries to find a heap that is good for compressed oops. 128 // heap_allocation_directory is the path to the backing memory for Java heap. When set, Java heap will be allocated 129 // on the device which is managed by the file system where the directory resides. 130 ReservedHeapSpace(size_t size, size_t forced_base_alignment, bool large, const char* heap_allocation_directory = NULL); 131 // Returns the base to be used for compression, i.e. so that null can be 132 // encoded safely and implicit null checks can work. 133 char *compressed_oop_base() { return _base - _noaccess_prefix; } 134 }; 135 136 // Class encapsulating behavior specific memory space for Code 137 class ReservedCodeSpace : public ReservedSpace { 138 public: 139 // Constructor 140 ReservedCodeSpace(size_t r_size, size_t rs_align, bool large); 141 }; 142 143 // VirtualSpace is data structure for committing a previously reserved address range in smaller chunks. 144 145 class VirtualSpace { 146 friend class VMStructs; 147 private: 148 // Reserved area 149 char* _low_boundary; 150 char* _high_boundary; 151 152 // Committed area 153 char* _low; 154 char* _high; 155 156 // The entire space has been committed and pinned in memory, no 157 // os::commit_memory() or os::uncommit_memory(). 158 bool _special; 159 160 // Need to know if commit should be executable. 161 bool _executable; 162 163 // MPSS Support 164 // Each virtualspace region has a lower, middle, and upper region. 165 // Each region has an end boundary and a high pointer which is the 166 // high water mark for the last allocated byte. 167 // The lower and upper unaligned to LargePageSizeInBytes uses default page. 168 // size. The middle region uses large page size. 169 char* _lower_high; 170 char* _middle_high; 171 char* _upper_high; 172 173 char* _lower_high_boundary; 174 char* _middle_high_boundary; 175 char* _upper_high_boundary; 176 177 size_t _lower_alignment; 178 size_t _middle_alignment; 179 size_t _upper_alignment; 180 181 // MPSS Accessors 182 char* lower_high() const { return _lower_high; } 183 char* middle_high() const { return _middle_high; } 184 char* upper_high() const { return _upper_high; } 185 186 char* lower_high_boundary() const { return _lower_high_boundary; } 187 char* middle_high_boundary() const { return _middle_high_boundary; } 188 char* upper_high_boundary() const { return _upper_high_boundary; } 189 190 size_t lower_alignment() const { return _lower_alignment; } 191 size_t middle_alignment() const { return _middle_alignment; } 192 size_t upper_alignment() const { return _upper_alignment; } 193 194 public: 195 // Committed area 196 char* low() const { return _low; } 197 char* high() const { return _high; } 198 199 // Reserved area 200 char* low_boundary() const { return _low_boundary; } 201 char* high_boundary() const { return _high_boundary; } 202 203 #if INCLUDE_AOT 204 // Set boundaries for code section in AOT library. 205 void set_low_boundary(char *p) { _low_boundary = p; } 206 void set_high_boundary(char *p) { _high_boundary = p; } 207 void set_low(char *p) { _low = p; } 208 void set_high(char *p) { _high = p; } 209 #endif 210 211 bool special() const { return _special; } 212 213 public: 214 // Initialization 215 VirtualSpace(); 216 bool initialize_with_granularity(ReservedSpace rs, size_t committed_byte_size, size_t max_commit_ganularity); 217 bool initialize(ReservedSpace rs, size_t committed_byte_size); 218 219 // Destruction 220 ~VirtualSpace(); 221 222 // Reserved memory 223 size_t reserved_size() const; 224 // Actually committed OS memory 225 size_t actual_committed_size() const; 226 // Memory used/expanded in this virtual space 227 size_t committed_size() const; 228 // Memory left to use/expand in this virtual space 229 size_t uncommitted_size() const; 230 231 bool contains(const void* p) const; 232 233 // Operations 234 // returns true on success, false otherwise 235 bool expand_by(size_t bytes, bool pre_touch = false); 236 void shrink_by(size_t bytes); 237 void release(); 238 239 void check_for_contiguity() PRODUCT_RETURN; 240 241 // Debugging 242 void print_on(outputStream* out) PRODUCT_RETURN; 243 void print(); 244 }; 245 246 #endif // SHARE_VM_RUNTIME_VIRTUALSPACE_HPP