diff options
Diffstat (limited to 'fs/bcachefs/bset.h')
| -rw-r--r-- | fs/bcachefs/bset.h | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/fs/bcachefs/bset.h b/fs/bcachefs/bset.h index a2e5e3ee68db..88f242191408 100644 --- a/fs/bcachefs/bset.h +++ b/fs/bcachefs/bset.h @@ -184,6 +184,38 @@ static inline enum bset_aux_tree_type bset_aux_tree_type(const struct bset_tree } } +/* + * BSET_CACHELINE was originally intended to match the hardware cacheline size - + * it used to be 64, but I realized the lookup code would touch slightly less + * memory if it was 128. + * + * It definites the number of bytes (in struct bset) per struct bkey_float in + * the auxiliar search tree - when we're done searching the bset_float tree we + * have this many bytes left that we do a linear search over. + * + * Since (after level 5) every level of the bset_tree is on a new cacheline, + * we're touching one fewer cacheline in the bset tree in exchange for one more + * cacheline in the linear search - but the linear search might stop before it + * gets to the second cacheline. + */ + +#define BSET_CACHELINE 128 + +static inline size_t btree_keys_cachelines(struct btree *b) +{ + return (1U << b->byte_order) / BSET_CACHELINE; +} + +static inline size_t btree_aux_data_bytes(struct btree *b) +{ + return btree_keys_cachelines(b) * 8; +} + +static inline size_t btree_aux_data_u64s(struct btree *b) +{ + return btree_aux_data_bytes(b) / sizeof(u64); +} + typedef void (*compiled_unpack_fn)(struct bkey *, const struct bkey_packed *); static inline void @@ -334,8 +366,6 @@ static inline struct bset *bset_next_set(struct btree *b, return ((void *) i) + round_up(vstruct_bytes(i), block_bytes); } -void bch2_btree_keys_free(struct btree *); -int bch2_btree_keys_alloc(struct btree *, unsigned, gfp_t); void bch2_btree_keys_init(struct btree *, bool *); void bch2_bset_init_first(struct btree *, struct bset *); |