diff options
Diffstat (limited to 'include/jemalloc/internal/base_types.h')
| -rw-r--r-- | include/jemalloc/internal/base_types.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/jemalloc/internal/base_types.h b/include/jemalloc/internal/base_types.h index be7ee82..b6db77d 100644 --- a/include/jemalloc/internal/base_types.h +++ b/include/jemalloc/internal/base_types.h @@ -4,4 +4,30 @@ typedef struct base_block_s base_block_t; typedef struct base_s base_t; +#define METADATA_THP_DEFAULT metadata_thp_disabled + +/* + * In auto mode, arenas switch to huge pages for the base allocator on the + * second base block. a0 switches to thp on the 5th block (after 20 megabytes + * of metadata), since more metadata (e.g. rtree nodes) come from a0's base. + */ + +#define BASE_AUTO_THP_THRESHOLD 2 +#define BASE_AUTO_THP_THRESHOLD_A0 5 + +typedef enum { + metadata_thp_disabled = 0, + /* + * Lazily enable hugepage for metadata. To avoid high RSS caused by THP + * + low usage arena (i.e. THP becomes a significant percentage), the + * "auto" option only starts using THP after a base allocator used up + * the first THP region. Starting from the second hugepage (in a single + * arena), "auto" behaves the same as "always", i.e. madvise hugepage + * right away. + */ + metadata_thp_auto = 1, + metadata_thp_always = 2, + metadata_thp_mode_limit = 3 +} metadata_thp_mode_t; + #endif /* JEMALLOC_INTERNAL_BASE_TYPES_H */ |