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mdbx: улучшение эвристики включения авто-слияния записей GC.

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Леонид Юрьев (Leonid Yuriev) 2022-10-10 21:06:33 +03:00
parent f5a6e0c04f
commit 5242c5bfdc
1 changed files with 8 additions and 6 deletions
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14
src/core.c
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@ -6509,21 +6509,23 @@ static pgr_t page_alloc_slowpath(MDBX_cursor *mc, const pgno_t num, int flags) {
const unsigned coalesce_threshold = env->me_maxgc_ov1page >> 2; const unsigned coalesce_threshold = env->me_maxgc_ov1page >> 2;
if (likely(flags & MDBX_ALLOC_GC)) { if (likely(flags & MDBX_ALLOC_GC)) {
flags |= env->me_flags & MDBX_LIFORECLAIM;
if (txn->mt_dbs[FREE_DBI].md_branch_pages &&
MDBX_PNL_GETSIZE(txn->tw.reclaimed_pglist) < coalesce_threshold)
flags |= MDBX_ALLOC_COALESCE;
if (unlikely( if (unlikely(
/* If mc is updating the GC, then the retired-list cannot play /* If mc is updating the GC, then the retired-list cannot play
catch-up with itself by growing while trying to save it. */ catch-up with itself by growing while trying to save it. */
(mc->mc_flags & C_RECLAIMING) || (mc->mc_flags & (C_RECLAIMING | C_GCFREEZE)) ||
/* avoid (recursive) search inside empty tree and while tree is /* avoid (recursive) search inside empty tree and while tree is
updating, todo4recovery://erased_by_github/libmdbx/issues/31 */ updating, todo4recovery://erased_by_github/libmdbx/issues/31 */
txn->mt_dbs[FREE_DBI].md_entries == 0 || txn->mt_dbs[FREE_DBI].md_entries == 0 ||
/* If our dirty list is already full, we can't touch GC */ /* If our dirty list is already full, we can't touch GC */
(txn->tw.dirtyroom < txn->mt_dbs[FREE_DBI].md_depth && (txn->tw.dirtyroom < txn->mt_dbs[FREE_DBI].md_depth &&
!(txn->mt_dbistate[FREE_DBI] & DBI_DIRTY)))) !(txn->mt_dbistate[FREE_DBI] & DBI_DIRTY))))
flags &= ~(MDBX_ALLOC_GC | MDBX_ALLOC_COALESCE); flags -= MDBX_ALLOC_GC;
else {
flags |= env->me_flags & MDBX_LIFORECLAIM;
if (txn->mt_dbs[FREE_DBI].md_branch_pages &&
MDBX_PNL_GETSIZE(txn->tw.reclaimed_pglist) < coalesce_threshold)
flags |= MDBX_ALLOC_COALESCE;
}
} }
eASSERT(env, pnl_check_allocated(txn->tw.reclaimed_pglist, eASSERT(env, pnl_check_allocated(txn->tw.reclaimed_pglist,