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mdbx: уменьшение кол-ва вызовов realloc().

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This commit is contained in:
Леонид Юрьев (Leonid Yuriev) 2022-12-26 20:28:18 +03:00
parent e458af602e
commit bb2e3967eb
1 changed files with 10 additions and 14 deletions
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24
src/core.c
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@ -2270,8 +2270,9 @@ static void pnl_shrink(MDBX_PNL *ppl) {
MDBX_PNL_ALLOCLEN(*ppl) >= MDBX_PNL_GETSIZE(*ppl));
MDBX_PNL_SETSIZE(*ppl, 0);
if (unlikely(MDBX_PNL_ALLOCLEN(*ppl) >
MDBX_PNL_INITIAL * 2 - MDBX_CACHELINE_SIZE / sizeof(pgno_t))) {
size_t bytes = pnl_size2bytes(MDBX_PNL_INITIAL);
MDBX_PNL_INITIAL * (MDBX_PNL_PREALLOC_FOR_RADIXSORT ? 8 : 4) -
MDBX_CACHELINE_SIZE / sizeof(pgno_t))) {
size_t bytes = pnl_size2bytes(MDBX_PNL_INITIAL * 2);
MDBX_PNL pl = osal_realloc(*ppl - 1, bytes);
if (likely(pl)) {
#if __GLIBC_PREREQ(2, 12) || defined(__FreeBSD__) || defined(malloc_usable_size)
@ -2815,19 +2816,14 @@ static int dpl_alloc(MDBX_txn *txn) {
tASSERT(txn, (txn->mt_flags & MDBX_TXN_RDONLY) == 0);
tASSERT(txn, (txn->mt_flags & MDBX_WRITEMAP) == 0 || MDBX_AVOID_MSYNC);
const int wanna = (txn->mt_env->me_options.dp_initial < txn->mt_geo.upper)
? txn->mt_env->me_options.dp_initial
: txn->mt_geo.upper;
if (txn->tw.dirtylist) {
dpl_clear(txn->tw.dirtylist);
const int realloc_threshold = 64;
if (likely(
!((int)(txn->tw.dirtylist->detent - wanna) > realloc_threshold ||
(int)(txn->tw.dirtylist->detent - wanna) < -realloc_threshold)))
return MDBX_SUCCESS;
}
if (unlikely(!dpl_reserve(txn, wanna)))
const size_t wanna = (txn->mt_env->me_options.dp_initial < txn->mt_geo.upper)
? txn->mt_env->me_options.dp_initial
: txn->mt_geo.upper;
if (unlikely(!txn->tw.dirtylist || txn->tw.dirtylist->detent < wanna ||
txn->tw.dirtylist->detent > wanna + wanna) &&
unlikely(!dpl_reserve(txn, wanna)))
return MDBX_ENOMEM;
dpl_clear(txn->tw.dirtylist);
return MDBX_SUCCESS;
}