1 #ifndef JEMALLOC_INTERNAL_BASE_TYPES_H 2 #define JEMALLOC_INTERNAL_BASE_TYPES_H 3 4 typedef struct base_block_s base_block_t; 5 typedef struct base_s base_t; 6 7 #define METADATA_THP_DEFAULT metadata_thp_disabled 8 9 /* 10 * In auto mode, arenas switch to huge pages for the base allocator on the 11 * second base block. a0 switches to thp on the 5th block (after 20 megabytes 12 * of metadata), since more metadata (e.g. rtree nodes) come from a0's base. 13 */ 14 15 #define BASE_AUTO_THP_THRESHOLD 2 16 #define BASE_AUTO_THP_THRESHOLD_A0 5 17 18 typedef enum { 19 metadata_thp_disabled = 0, 20 /* 21 * Lazily enable hugepage for metadata. To avoid high RSS caused by THP 22 * + low usage arena (i.e. THP becomes a significant percentage), the 23 * "auto" option only starts using THP after a base allocator used up 24 * the first THP region. Starting from the second hugepage (in a single 25 * arena), "auto" behaves the same as "always", i.e. madvise hugepage 26 * right away. 27 */ 28 metadata_thp_auto = 1, 29 metadata_thp_always = 2, 30 metadata_thp_mode_limit = 3 31 } metadata_thp_mode_t; 32 33 #endif /* JEMALLOC_INTERNAL_BASE_TYPES_H */ 34
