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mdbx: rework/speedup filtering of dirty-list from loose-pages inside mdbx_update_gc().

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Change-Id: Icf4101fa77314ab79be90ee429cf2df639686d7e
This commit is contained in:
Leonid Yuriev 2018-08-25 21:12:30 +03:00 committed by Leo Yuriev
parent 8abff4773f
commit f373a0ca84
2 changed files with 24 additions and 8 deletions
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2
src/bits.h
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@ -504,7 +504,7 @@ typedef txnid_t *MDBX_TXL;
typedef union MDBX_ID2 {
struct {
pgno_t pgno;
MDBX_page *ptr;
void *ptr;
};
unsigned limit, length;
} MDBX_ID2;

30
src/mdbx.c
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@ -3662,19 +3662,22 @@ retry:
mdbx_pnl_xmerge(env->me_reclaimed_pglist, loose);
}
// filter-out list of dirty-pages from loose-pages
MDBX_ID2L dl = txn->mt_rw_dirtylist;
mdbx_mid2l_sort(dl);
unsigned left = dl->length;
for (MDBX_page *mp = txn->mt_loose_pages; mp;) {
mdbx_tassert(txn, mp->mp_pgno < txn->mt_next_pgno);
mdbx_ensure(env, mp->mp_pgno >= NUM_METAS);
unsigned s, d;
for (s = d = 0; ++s <= dl[0].length;)
if (dl[s].pgno != mp->mp_pgno)
dl[++d] = dl[s];
dl[0].length -= 1;
mdbx_tassert(txn, dl[0].length == d);
if (left > 0) {
const unsigned i = mdbx_mid2l_search(dl, mp->mp_pgno);
if (i <= dl->length && dl[i].pgno == mp->mp_pgno) {
mdbx_tassert(txn, i > 0 && dl[i].ptr != dl);
dl[i].ptr = dl /* mark for deletion */;
}
left -= 1;
}
MDBX_page *dp = mp;
mp = NEXT_LOOSE_PAGE(mp);
@ -3682,6 +3685,19 @@ retry:
mdbx_dpage_free(env, dp);
}
if (left > 0) {
MDBX_ID2L r, w, end = dl + dl->length;
for (r = w = dl + 1; r <= end; r++) {
if (r->ptr != dl) {
if (r != w)
*w = *r;
++w;
}
}
mdbx_tassert(txn, w - dl == (int)left + 1);
}
dl->length = left;
txn->mt_loose_pages = NULL;
txn->mt_loose_count = 0;
}