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mdbx: backport - avoid empty and unneeded large/overflow pages (squashed).

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This commit is contained in:
Leonid Yuriev 2018-09-23 13:06:06 +03:00
parent d2854e0760
commit 5049c86517
1 changed files with 6 additions and 2 deletions
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8
src/mdbx.c
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@ -7906,7 +7906,10 @@ int mdbx_cursor_put(MDBX_cursor *mc, MDBX_val *key, MDBX_val *data,
if (F_ISSET(leaf->mn_flags, F_BIGDATA)) { if (F_ISSET(leaf->mn_flags, F_BIGDATA)) {
MDBX_page *omp; MDBX_page *omp;
pgno_t pg; pgno_t pg;
int level, ovpages, dpages = OVPAGES(env, data->iov_len); int level, ovpages,
dpages = (LEAFSIZE(key, data) > env->me_nodemax)
? OVPAGES(env, data->iov_len)
: 0;
memcpy(&pg, olddata.iov_base, sizeof(pg)); memcpy(&pg, olddata.iov_base, sizeof(pg));
if (unlikely((rc2 = mdbx_page_get(mc, pg, &omp, &level)) != 0)) if (unlikely((rc2 = mdbx_page_get(mc, pg, &omp, &level)) != 0))
@ -7914,7 +7917,8 @@ int mdbx_cursor_put(MDBX_cursor *mc, MDBX_val *key, MDBX_val *data,
ovpages = omp->mp_pages; ovpages = omp->mp_pages;
/* Is the ov page large enough? */ /* Is the ov page large enough? */
if (ovpages >= dpages) { if (ovpages ==
/* LY: add configuragle theshold to keep reserve space */ dpages) {
if (!(omp->mp_flags & P_DIRTY) && if (!(omp->mp_flags & P_DIRTY) &&
(level || (env->me_flags & MDBX_WRITEMAP))) { (level || (env->me_flags & MDBX_WRITEMAP))) {
rc = mdbx_page_unspill(mc->mc_txn, omp, &omp); rc = mdbx_page_unspill(mc->mc_txn, omp, &omp);