1 /* Malloc huge page support. Generic implementation. 2 Copyright (C) 2021-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public License as 7 published by the Free Software Foundation; either version 2.1 of the 8 License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; see the file COPYING.LIB. If 17 not, see <https://www.gnu.org/licenses/>. */ 18 19 #ifndef _MALLOC_HUGEPAGES_H 20 #define _MALLOC_HUGEPAGES_H 21 22 #include <stddef.h> 23 24 /* Return the default transparent huge page size. */ 25 unsigned long int __malloc_default_thp_pagesize (void) attribute_hidden; 26 27 enum malloc_thp_mode_t 28 { 29 malloc_thp_mode_always, 30 malloc_thp_mode_madvise, 31 malloc_thp_mode_never, 32 malloc_thp_mode_not_supported 33 }; 34 35 enum malloc_thp_mode_t __malloc_thp_mode (void) attribute_hidden; 36 37 /* Return the supported huge page size from the REQUESTED sizes on PAGESIZE 38 along with the required extra mmap flags on FLAGS, Requesting the value 39 of 0 returns the default huge page size, otherwise the value will be 40 matched against the sizes supported by the system. */ 41 void __malloc_hugepage_config (size_t requested, size_t *pagesize, int *flags) 42 attribute_hidden; 43 44 #endif /* _MALLOC_HUGEPAGES_H */ 45