1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) 2019 Red Hat, Inc. 4 */ 5 6 #ifndef TST_HUGEPAGE__ 7 #define TST_HUGEPAGE__ 8 9 #define PATH_HUGEPAGES "/sys/kernel/mm/hugepages/" 10 #define PATH_NR_HPAGES "/proc/sys/vm/nr_hugepages" 11 #define PATH_OC_HPAGES "/proc/sys/vm/nr_overcommit_hugepages" 12 13 #define MEMINFO_HPAGE_TOTAL "HugePages_Total:" 14 #define MEMINFO_HPAGE_FREE "HugePages_Free:" 15 #define MEMINFO_HPAGE_RSVD "HugePages_Rsvd:" 16 #define MEMINFO_HPAGE_SURP "HugePages_Surp:" 17 #define MEMINFO_HPAGE_SIZE "Hugepagesize:" 18 19 extern char *nr_opt; /* -s num Set the number of the been allocated hugepages */ 20 extern char *Hopt; /* -H /.. Location of hugetlbfs, i.e. -H /var/hugetlbfs */ 21 22 enum tst_hp_policy { 23 TST_REQUEST, 24 TST_NEEDS, 25 }; 26 27 #define TST_NO_HUGEPAGES ((unsigned long)-1) 28 29 struct tst_hugepage { 30 const unsigned long number; 31 enum tst_hp_policy policy; 32 }; 33 34 /* 35 * Get the default hugepage size. Returns 0 if hugepages are not supported. 36 */ 37 size_t tst_get_hugepage_size(void); 38 39 /* 40 * Try the best to request a specified number of huge pages from system, 41 * it will store the reserved hpage number in tst_hugepages. 42 * 43 * Note: this depend on the status of system memory fragmentation. 44 */ 45 unsigned long tst_reserve_hugepages(struct tst_hugepage *hp); 46 47 /* 48 * This variable is used for recording the number of hugepages which system can 49 * provides. It will be equal to 'hpages' if tst_reserve_hugepages on success, 50 * otherwise set it to a number of hugepages that we were able to reserve. 51 * 52 * If system does not support hugetlb, then it will be set to 0. 53 */ 54 extern unsigned long tst_hugepages; 55 56 #endif /* TST_HUGEPAGE_H */ 57