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 #ifndef OS_CPU_LINUX_X86_GC_Z_ZBACKINGFILE_LINUX_X86_HPP 25 #define OS_CPU_LINUX_X86_GC_Z_ZBACKINGFILE_LINUX_X86_HPP 26 27 #include "memory/allocation.hpp" 28 29 class ZBackingFile { 30 private: 31 static bool _hugetlbfs_mmap_retry; 32 33 int _fd; 34 uint64_t _filesystem; 35 size_t _available; 36 bool _initialized; 37 38 int create_mem_fd(const char* name) const; 39 int create_file_fd(const char* name) const; 40 int create_fd(const char* name) const; 41 42 bool is_tmpfs() const; 43 bool is_hugetlbfs() const; 44 bool tmpfs_supports_transparent_huge_pages() const; 45 46 bool try_split_and_expand_tmpfs(size_t offset, size_t length, size_t alignment) const; 47 bool try_expand_tmpfs(size_t offset, size_t length, size_t alignment) const; 48 bool try_expand_tmpfs(size_t offset, size_t length) const; 49 bool try_expand_hugetlbfs(size_t offset, size_t length) const; 50 bool try_expand_tmpfs_or_hugetlbfs(size_t offset, size_t length, size_t alignment) const; 51 52 public: 53 ZBackingFile(); 54 55 bool is_initialized() const; 56 57 int fd() const; 58 size_t available() const; 59 60 size_t try_expand(size_t offset, size_t length, size_t alignment) const; 61 }; 62 63 #endif // OS_CPU_LINUX_X86_GC_Z_ZBACKINGFILE_LINUX_X86_HPP