diff options
Diffstat (limited to 'deps/jemalloc/include/jemalloc/internal/sc.h')
| -rw-r--r-- | deps/jemalloc/include/jemalloc/internal/sc.h | 78 |
1 files changed, 51 insertions, 27 deletions
diff --git a/deps/jemalloc/include/jemalloc/internal/sc.h b/deps/jemalloc/include/jemalloc/internal/sc.h index 9a099d8b6..9bab347be 100644 --- a/deps/jemalloc/include/jemalloc/internal/sc.h +++ b/deps/jemalloc/include/jemalloc/internal/sc.h @@ -197,30 +197,34 @@ (SC_LG_BASE_MAX - SC_LG_FIRST_REGULAR_BASE + 1) - 1) #define SC_NSIZES (SC_NTINY + SC_NPSEUDO + SC_NREGULAR) -/* The number of size classes that are a multiple of the page size. */ -#define SC_NPSIZES ( \ - /* Start with all the size classes. */ \ - SC_NSIZES \ - /* Subtract out those groups with too small a base. */ \ - - (LG_PAGE - 1 - SC_LG_FIRST_REGULAR_BASE) * SC_NGROUP \ - /* And the pseudo-group. */ \ - - SC_NPSEUDO \ - /* And the tiny group. */ \ - - SC_NTINY \ - /* Sizes where ndelta*delta is not a multiple of the page size. */ \ - - (SC_LG_NGROUP * SC_NGROUP)) /* - * Note that the last line is computed as the sum of the second column in the - * following table: - * lg(base) | count of sizes to exclude - * ------------------------------|----------------------------- - * LG_PAGE - 1 | SC_NGROUP - 1 - * LG_PAGE | SC_NGROUP - 1 - * LG_PAGE + 1 | SC_NGROUP - 2 - * LG_PAGE + 2 | SC_NGROUP - 4 - * ... | ... - * LG_PAGE + (SC_LG_NGROUP - 1) | SC_NGROUP - (SC_NGROUP / 2) + * The number of size classes that are a multiple of the page size. + * + * Here are the first few bases that have a page-sized SC. + * + * lg(base) | base | highest SC | page-multiple SCs + * --------------|------------------------------------------ + * LG_PAGE - 1 | PAGE / 2 | PAGE | 1 + * LG_PAGE | PAGE | 2 * PAGE | 1 + * LG_PAGE + 1 | 2 * PAGE | 4 * PAGE | 2 + * LG_PAGE + 2 | 4 * PAGE | 8 * PAGE | 4 + * + * The number of page-multiple SCs continues to grow in powers of two, up until + * lg_delta == lg_page, which corresponds to setting lg_base to lg_page + + * SC_LG_NGROUP. So, then, the number of size classes that are multiples of the + * page size whose lg_delta is less than the page size are + * is 1 + (2**0 + 2**1 + ... + 2**(lg_ngroup - 1) == 2**lg_ngroup. + * + * For each base with lg_base in [lg_page + lg_ngroup, lg_base_max), there are + * NGROUP page-sized size classes, and when lg_base == lg_base_max, there are + * NGROUP - 1. + * + * This gives us the quantity we seek. */ +#define SC_NPSIZES ( \ + SC_NGROUP \ + + (SC_LG_BASE_MAX - (LG_PAGE + SC_LG_NGROUP)) * SC_NGROUP \ + + SC_NGROUP - 1) /* * We declare a size class is binnable if size < page size * group. Or, in other @@ -242,17 +246,23 @@ # error "Too many small size classes" #endif -/* The largest size class in the lookup table. */ -#define SC_LOOKUP_MAXCLASS ((size_t)1 << 12) +/* The largest size class in the lookup table, and its binary log. */ +#define SC_LG_MAX_LOOKUP 12 +#define SC_LOOKUP_MAXCLASS (1 << SC_LG_MAX_LOOKUP) /* Internal, only used for the definition of SC_SMALL_MAXCLASS. */ -#define SC_SMALL_MAX_BASE ((size_t)1 << (LG_PAGE + SC_LG_NGROUP - 1)) -#define SC_SMALL_MAX_DELTA ((size_t)1 << (LG_PAGE - 1)) +#define SC_SMALL_MAX_BASE (1 << (LG_PAGE + SC_LG_NGROUP - 1)) +#define SC_SMALL_MAX_DELTA (1 << (LG_PAGE - 1)) /* The largest size class allocated out of a slab. */ #define SC_SMALL_MAXCLASS (SC_SMALL_MAX_BASE \ + (SC_NGROUP - 1) * SC_SMALL_MAX_DELTA) +/* The fastpath assumes all lookup-able sizes are small. */ +#if (SC_SMALL_MAXCLASS < SC_LOOKUP_MAXCLASS) +# error "Lookup table sizes must be small" +#endif + /* The smallest size class not allocated out of a slab. */ #define SC_LARGE_MINCLASS ((size_t)1ULL << (LG_PAGE + SC_LG_NGROUP)) #define SC_LG_LARGE_MINCLASS (LG_PAGE + SC_LG_NGROUP) @@ -264,6 +274,19 @@ /* The largest size class supported. */ #define SC_LARGE_MAXCLASS (SC_MAX_BASE + (SC_NGROUP - 1) * SC_MAX_DELTA) +/* Maximum number of regions in one slab. */ +#ifndef CONFIG_LG_SLAB_MAXREGS +# define SC_LG_SLAB_MAXREGS (LG_PAGE - SC_LG_TINY_MIN) +#else +# if CONFIG_LG_SLAB_MAXREGS < (LG_PAGE - SC_LG_TINY_MIN) +# error "Unsupported SC_LG_SLAB_MAXREGS" +# else +# define SC_LG_SLAB_MAXREGS CONFIG_LG_SLAB_MAXREGS +# endif +#endif + +#define SC_SLAB_MAXREGS (1U << SC_LG_SLAB_MAXREGS) + typedef struct sc_s sc_t; struct sc_s { /* Size class index, or -1 if not a valid size class. */ @@ -321,10 +344,11 @@ struct sc_data_s { sc_t sc[SC_NSIZES]; }; +size_t reg_size_compute(int lg_base, int lg_delta, int ndelta); void sc_data_init(sc_data_t *data); /* * Updates slab sizes in [begin, end] to be pgs pages in length, if possible. - * Otherwise, does its best to accomodate the request. + * Otherwise, does its best to accommodate the request. */ void sc_data_update_slab_size(sc_data_t *data, size_t begin, size_t end, int pgs); |