1 /* 2 * Copyright (c) 2015, 2020, 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 #ifndef OS_LINUX_GC_Z_ZPHYSICALMEMORYBACKING_LINUX_HPP 25 #define OS_LINUX_GC_Z_ZPHYSICALMEMORYBACKING_LINUX_HPP 26 27 class ZErrno; 28 29 class ZPhysicalMemoryBacking { 30 private: 31 int _fd; 32 size_t _size; 33 uint64_t _filesystem; 34 size_t _block_size; 35 size_t _available; 36 bool _initialized; 37 38 void warn_available_space(size_t max_capacity) const; 39 void warn_max_map_count(size_t max_capacity) const; 40 41 int create_mem_fd(const char* name) const; 42 int create_file_fd(const char* name) const; 43 int create_fd(const char* name) const; 44 45 bool is_tmpfs() const; 46 bool is_hugetlbfs() const; 47 bool tmpfs_supports_transparent_huge_pages() const; 48 49 ZErrno fallocate_compat_mmap_hugetlbfs(size_t offset, size_t length, bool touch) const; 50 ZErrno fallocate_compat_mmap_tmpfs(size_t offset, size_t length) const; 51 ZErrno fallocate_compat_pwrite(size_t offset, size_t length) const; 52 ZErrno fallocate_fill_hole_compat(size_t offset, size_t length) const; 53 ZErrno fallocate_fill_hole_syscall(size_t offset, size_t length) const; 54 ZErrno fallocate_fill_hole(size_t offset, size_t length) const; 55 ZErrno fallocate_punch_hole(size_t offset, size_t length) const; 56 ZErrno split_and_fallocate(bool punch_hole, size_t offset, size_t length) const; 57 ZErrno fallocate(bool punch_hole, size_t offset, size_t length) const; 58 59 bool commit_inner(size_t offset, size_t length) const; 60 size_t commit_numa_interleaved(size_t offset, size_t length) const; 61 size_t commit_default(size_t offset, size_t length) const; 62 63 public: 64 ZPhysicalMemoryBacking(size_t max_capacity); 65 66 bool is_initialized() const; 67 68 void warn_commit_limits(size_t max_capacity) const; 69 70 size_t commit(size_t offset, size_t length) const; 71 size_t uncommit(size_t offset, size_t length) const; 72 73 void map(uintptr_t addr, size_t size, uintptr_t offset) const; 74 void unmap(uintptr_t addr, size_t size) const; 75 }; 76 77 #endif // OS_LINUX_GC_Z_ZPHYSICALMEMORYBACKING_LINUX_HPP 78