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mdbx: ранняя/не-отложенная очистка GC (начало).

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Леонид Юрьев (Leonid Yuriev)
2025-06-03 21:54:24 +03:00
parent 40af0565c5
commit bb37c93dd5
13 changed files with 97 additions and 85 deletions
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38
src/pnl.h
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@@ -56,21 +56,6 @@ typedef const pgno_t *const_pnl_t;
#define MDBX_PNL_SIZEOF(pl) ((MDBX_PNL_GETSIZE(pl) + 1) * sizeof(pgno_t))
#define MDBX_PNL_IS_EMPTY(pl) (MDBX_PNL_GETSIZE(pl) == 0)
MDBX_NOTHROW_PURE_FUNCTION MDBX_MAYBE_UNUSED static inline size_t pnl_size2bytes(size_t size) {
assert(size > 0 && size <= PAGELIST_LIMIT);
#if MDBX_PNL_PREALLOC_FOR_RADIXSORT
size += size;
#endif /* MDBX_PNL_PREALLOC_FOR_RADIXSORT */
STATIC_ASSERT(MDBX_ASSUME_MALLOC_OVERHEAD +
(PAGELIST_LIMIT * (MDBX_PNL_PREALLOC_FOR_RADIXSORT + 1) + MDBX_PNL_GRANULATE + 3) * sizeof(pgno_t) <
SIZE_MAX / 4 * 3);
size_t bytes =
ceil_powerof2(MDBX_ASSUME_MALLOC_OVERHEAD + sizeof(pgno_t) * (size + 3), MDBX_PNL_GRANULATE * sizeof(pgno_t)) -
MDBX_ASSUME_MALLOC_OVERHEAD;
return bytes;
}
MDBX_NOTHROW_PURE_FUNCTION MDBX_MAYBE_UNUSED static inline pgno_t pnl_bytes2size(const size_t bytes) {
size_t size = bytes / sizeof(pgno_t);
assert(size > 3 && size <= PAGELIST_LIMIT + /* alignment gap */ 65536);
@@ -81,6 +66,22 @@ MDBX_NOTHROW_PURE_FUNCTION MDBX_MAYBE_UNUSED static inline pgno_t pnl_bytes2size
return (pgno_t)size;
}
MDBX_NOTHROW_PURE_FUNCTION MDBX_MAYBE_UNUSED static inline size_t pnl_size2bytes(size_t wanna_size) {
size_t size = wanna_size;
assert(size > 0 && size <= PAGELIST_LIMIT);
#if MDBX_PNL_PREALLOC_FOR_RADIXSORT
size += size;
#endif /* MDBX_PNL_PREALLOC_FOR_RADIXSORT */
STATIC_ASSERT(MDBX_ASSUME_MALLOC_OVERHEAD +
(PAGELIST_LIMIT * (MDBX_PNL_PREALLOC_FOR_RADIXSORT + 1) + MDBX_PNL_GRANULATE + 3) * sizeof(pgno_t) <
SIZE_MAX / 4 * 3);
size_t bytes =
ceil_powerof2(MDBX_ASSUME_MALLOC_OVERHEAD + sizeof(pgno_t) * (size + 3), MDBX_PNL_GRANULATE * sizeof(pgno_t)) -
MDBX_ASSUME_MALLOC_OVERHEAD;
assert(pnl_bytes2size(bytes) >= wanna_size);
return bytes;
}
MDBX_INTERNAL pnl_t pnl_alloc(size_t size);
MDBX_INTERNAL void pnl_free(pnl_t pnl);
@@ -106,6 +107,13 @@ MDBX_MAYBE_UNUSED static inline void pnl_append_prereserved(__restrict pnl_t pnl
MDBX_PNL_LAST(pnl) = pgno;
}
MDBX_MAYBE_UNUSED static inline int __must_check_result pnl_append(__restrict pnl_t *ppnl, pgno_t pgno) {
int rc = pnl_need(ppnl, 1);
if (likely(rc == MDBX_SUCCESS))
pnl_append_prereserved(*ppnl, pgno);
return rc;
}
MDBX_INTERNAL void pnl_shrink(pnl_t __restrict *__restrict ppnl);
MDBX_INTERNAL int __must_check_result spill_append_span(__restrict pnl_t *ppnl, pgno_t pgno, size_t n);