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daan 2021-11-13 14:03:16 -08:00
parent 8bf16746e9
commit 9afc253726
3 changed files with 70 additions and 69 deletions
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21
include/mimalloc-types.h
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@ -287,17 +287,26 @@ typedef enum mi_segment_kind_e {
MI_SEGMENT_HUGE, // > MI_LARGE_SIZE_MAX segment with just one huge page inside.
} mi_segment_kind_t;
#define MI_COMMIT_SIZE (4*64*1024)
#define MI_COMMIT_MASK_BITS (MI_SEGMENT_SIZE / MI_COMMIT_SIZE)
#define MI_COMMIT_MASK_FIELD_BITS MI_SIZE_BITS
#define MI_COMMIT_MASK_N (MI_COMMIT_MASK_BITS / MI_COMMIT_MASK_FIELD_BITS)
// ------------------------------------------------------
// A segment holds a commit mask where a bit is set if
// the corresponding MI_COMMIT_SIZE area is committed.
// The MI_COMMIT_SIZE must be a multiple of the slice
// size. We define it as equal so we can decommit on a
// slice level which helps with (real) memory fragmentation
// over time.
// ------------------------------------------------------
#if (MI_COMMIT_MASK_BITS != (MI_COMMIT_MASK_N * MI_COMMIT_MASK_FIELD_BITS))
#define MI_COMMIT_SIZE (MI_SEGMENT_SLICE_SIZE)
#define MI_COMMIT_MASK_BITS (MI_SEGMENT_SIZE / MI_COMMIT_SIZE)
#define MI_COMMIT_MASK_FIELD_BITS MI_SIZE_BITS
#define MI_COMMIT_MASK_FIELD_COUNT (MI_COMMIT_MASK_BITS / MI_COMMIT_MASK_FIELD_BITS)
#if (MI_COMMIT_MASK_BITS != (MI_COMMIT_MASK_FIELD_COUNT * MI_COMMIT_MASK_FIELD_BITS))
#error "the segment size must be exactly divisible by the (commit size * size_t bits)"
#endif
typedef struct mi_commit_mask_s {
size_t mask[MI_COMMIT_MASK_N];
size_t mask[MI_COMMIT_MASK_FIELD_COUNT];
} mi_commit_mask_t;
typedef mi_page_t mi_slice_t;