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mdbx: auto-coalesce of GC's records with less overhead.

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Леонид Юрьев (Leonid Yuriev) 2022-07-24 21:20:22 +03:00
parent 47d5fa7fd4
commit dc39ecfb9f
2 changed files with 8 additions and 14 deletions
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20
src/core.c
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@ -6645,19 +6645,18 @@ __hot static pgno_t *scan4range(const MDBX_PNL pnl, const unsigned len,
#define MDBX_ALLOC_NOLOG 32
#define MDBX_ALLOC_ALL (MDBX_ALLOC_GC | MDBX_ALLOC_NEW)
__cold static pgr_t page_alloc_slowpath(MDBX_cursor *mc, const pgno_t num,
int flags) {
static pgr_t page_alloc_slowpath(MDBX_cursor *mc, const pgno_t num, int flags) {
pgr_t ret;
MDBX_txn *const txn = mc->mc_txn;
MDBX_env *const env = txn->mt_env;
mdbx_assert(env, num == 0 || !(flags & MDBX_ALLOC_SLOT));
mdbx_assert(env, num > 0 || !(flags & MDBX_ALLOC_NEW));
const unsigned coalesce_threshold =
env->me_maxgc_ov1page - env->me_maxgc_ov1page / 4;
const unsigned coalesce_threshold = env->me_maxgc_ov1page >> 2;
if (likely(flags & MDBX_ALLOC_GC)) {
flags |= env->me_flags & MDBX_LIFORECLAIM;
if (MDBX_PNL_SIZE(txn->tw.reclaimed_pglist) < coalesce_threshold)
if (txn->mt_dbs[FREE_DBI].md_branch_pages &&
MDBX_PNL_SIZE(txn->tw.reclaimed_pglist) < coalesce_threshold)
flags |= MDBX_ALLOC_COALESCE;
if (unlikely(
/* If mc is updating the GC, then the retired-list cannot play
@ -6858,7 +6857,6 @@ __cold static pgr_t page_alloc_slowpath(MDBX_cursor *mc, const pgno_t num,
}
/* Merge in descending sorted order */
const unsigned prev_re_len = MDBX_PNL_SIZE(re_list);
pnl_merge(re_list, gc_pnl);
if (mdbx_audit_enabled() &&
unlikely(!mdbx_pnl_check(re_list, txn->mt_next_pgno))) {
@ -6891,15 +6889,11 @@ __cold static pgr_t page_alloc_slowpath(MDBX_cursor *mc, const pgno_t num,
}
/* Don't try to coalesce too much. */
if (flags & MDBX_ALLOC_COALESCE) {
if (re_len /* current size */ > coalesce_threshold ||
(re_len > prev_re_len &&
re_len - prev_re_len /* delta from prev */ >=
coalesce_threshold / 2)) {
if (re_len /* current size */ > coalesce_threshold) {
if (flags & MDBX_ALLOC_COALESCE)
mdbx_trace("clear %s %s", "MDBX_ALLOC_COALESCE",
"since got threshold");
flags &= ~MDBX_ALLOC_COALESCE;
}
flags &= ~MDBX_ALLOC_COALESCE;
}
}

2
src/internals.h
View File

@ -1109,7 +1109,7 @@ struct MDBX_env {
#define MDBX_ENV_TXKEY UINT32_C(0x10000000)
/* Legacy MDBX_MAPASYNC (prior v0.9) */
#define MDBX_DEPRECATED_MAPASYNC UINT32_C(0x100000)
/* Legacy MDBX_MAPASYNC (prior v0.12) */
/* Legacy MDBX_COALESCE (prior v0.12) */
#define MDBX_DEPRECATED_COALESCE UINT32_C(0x2000000)
#define ENV_INTERNAL_FLAGS (MDBX_FATAL_ERROR | MDBX_ENV_ACTIVE | MDBX_ENV_TXKEY)
uint32_t me_flags;