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Fix child txn dirty_room counts in spill/unspill

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Don't count pages twice if they're already accounted in an ancestor txn.
This commit is contained in:
Howard Chu 2013-07-14 16:53:04 -07:00
parent 2c3488aeeb
commit 501eac2fc4
1 changed files with 36 additions and 1 deletions
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37
libraries/liblmdb/mdb.c
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@ -1478,7 +1478,26 @@ mdb_page_spill(MDB_cursor *m0, MDB_val *key, MDB_val *data)
mdb_cursorpages_mark(m0, P_DIRTY|P_KEEP);
if (rc == 0) {
txn->mt_dirty_room = MDB_IDL_UM_MAX - dl[0].mid;
if (txn->mt_parent) {
MDB_txn *tx2;
pgno_t pgno = dl[i].mid;
txn->mt_dirty_room = txn->mt_parent->mt_dirty_room - dl[0].mid;
/* dirty pages that are dirty in an ancestor don't
* count against this txn's dirty_room.
*/
for (i=1; i<=dl[0].mid; i++) {
for (tx2 = txn->mt_parent; tx2; tx2 = tx2->mt_parent) {
j = mdb_mid2l_search(tx2->mt_u.dirty_list, pgno);
if (j <= tx2->mt_u.dirty_list[0].mid &&
tx2->mt_u.dirty_list[j].mid == pgno) {
txn->mt_dirty_room++;
break;
}
}
}
} else {
txn->mt_dirty_room = MDB_IDL_UM_MAX - dl[0].mid;
}
txn->mt_flags |= MDB_TXN_SPILLS;
}
return rc;
@ -1743,6 +1762,22 @@ mdb_page_unspill(MDB_txn *tx0, MDB_page *mp, MDB_page **ret)
} /* otherwise, if belonging to a parent txn, the
* page remains spilled until child commits
*/
if (txn->mt_parent) {
MDB_txn *tx2;
/* If this page is also in a parent's dirty list, then
* it's already accounted in dirty_room, and we need to
* cancel out the decrement that mdb_page_dirty does.
*/
for (tx2 = txn->mt_parent; tx2; tx2 = tx2->mt_parent) {
x = mdb_mid2l_search(tx2->mt_u.dirty_list, pgno);
if (x <= tx2->mt_u.dirty_list[0].mid &&
tx2->mt_u.dirty_list[x].mid == pgno) {
txn->mt_dirty_room++;
break;
}
}
}
mdb_page_dirty(tx0, np);
np->mp_flags |= P_DIRTY;
*ret = np;