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mdb_page_get() can ignore the toplevel spill list

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...when we search dirty list before instead of after spill list.
This commit is contained in:
Hallvard Furuseth 2017-07-29 07:59:39 +02:00 committed by Howard Chu
parent d6cf476169
commit 8b31a4a62b
1 changed files with 22 additions and 15 deletions
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37
libraries/liblmdb/mdb.c
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@ -6664,26 +6664,17 @@ mdb_page_get(MDB_cursor *mc, pgno_t pgno,
#endif
MDB_page **ret)
{
MDB_txn *txn = mc->mc_txn;
MDB_txn *txn = mc->mc_txn, *tx2;
MDB_page *p = NULL;
if (! (mc->mc_flags & (C_ORIG_RDONLY|C_WRITEMAP))) {
MDB_txn *tx2 = txn;
do {
for (tx2 = txn;; ) {
MDB_ID2L dl = tx2->mt_u.dirty_list;
MDB_IDL sl;
unsigned x;
/* Spilled pages were dirtied in this txn and flushed
* because the dirty list got full. Bring this page
* back in from the map (but don't unspill it here,
* leave that unless page_touch happens again).
/* tx2 may have malloced its own "dirty" version of the
* page, with the same page number.
*/
if (tx2->mt_spill_pgs) {
MDB_ID pn = pgno << 1;
x = mdb_midl_search(tx2->mt_spill_pgs, pn);
if (x <= tx2->mt_spill_pgs[0] && tx2->mt_spill_pgs[x] == pn) {
goto mapped;
}
}
if (dl[0].mid) {
unsigned x = mdb_mid2l_search(dl, pgno);
if (x <= dl[0].mid && dl[x].mid == pgno) {
@ -6691,7 +6682,23 @@ mdb_page_get(MDB_cursor *mc, pgno_t pgno,
goto done;
}
}
} while ((tx2 = tx2->mt_parent) != NULL);
/* Spilled pages were dirtied in this txn, then cleaned
* and flushed to the map when dirty_list got full.
* Check if tx2 spilled the page before moving on to
* search the parent. (But don't unspill here, leave
* that unless page_touch happens again.)
*/
sl = tx2->mt_spill_pgs;
if ((tx2 = tx2->mt_parent) == NULL)
break;
if (sl) {
MDB_ID pn = pgno << 1;
x = mdb_midl_search(sl, pn);
if (x <= sl[0] && sl[x] == pn) {
goto mapped;
}
}
}
}
if (pgno >= txn->mt_next_pgno) {