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Keep re-using dpages instead of freeing them

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This commit is contained in:
Howard Chu 2011-08-19 16:43:57 -07:00
parent ca496bd357
commit 66a647e55d
1 changed files with 38 additions and 7 deletions
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45
libraries/libmdb/mdb.c
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@ -339,6 +339,7 @@ struct MDB_env {
MDB_db *me_dbs[2];
MDB_oldpages *me_pghead;
pthread_key_t me_txkey; /* thread-key for readers */
MDB_dpage *me_dpages;
pgno_t me_free_pgs[MDB_IDL_UM_SIZE];
MIDL2 me_dirty_list[MDB_IDL_DB_SIZE];
};
@ -610,8 +611,13 @@ mdb_alloc_page(MDB_txn *txn, MDB_page *parent, unsigned int parent_idx, int num)
if (txn->mt_next_pgno + num >= txn->mt_env->me_maxpg)
return NULL;
}
if ((dp = malloc(txn->mt_env->me_psize * num + sizeof(MDB_dhead))) == NULL)
return NULL;
if (txn->mt_env->me_dpages && num == 1) {
dp = txn->mt_env->me_dpages;
txn->mt_env->me_dpages = (MDB_dpage *)dp->h.md_parent;
} else {
if ((dp = malloc(txn->mt_env->me_psize * num + sizeof(MDB_dhead))) == NULL)
return NULL;
}
dp->h.md_num = num;
dp->h.md_parent = parent;
dp->h.md_pi = parent_idx;
@ -771,11 +777,20 @@ mdb_txn_abort(MDB_txn *txn)
txn->mt_u.reader->mr_txnid = 0;
} else {
MDB_oldpages *mop;
MDB_dpage *dp;
unsigned int i;
/* Discard all dirty pages. */
for (i=1; i<=txn->mt_u.dirty_list[0].mid; i++)
free(txn->mt_u.dirty_list[i].mptr);
/* return all dirty pages to dpage list */
for (i=1; i<=txn->mt_u.dirty_list[0].mid; i++) {
dp = txn->mt_u.dirty_list[i].mptr;
if (dp->h.md_num == 1) {
dp->h.md_parent = (MDB_page *)txn->mt_env->me_dpages;
txn->mt_env->me_dpages = dp;
} else {
/* large pages just get freed directly */
free(dp);
}
}
while ((mop = txn->mt_env->me_pghead)) {
txn->mt_env->me_pghead = mop->mo_next;
@ -953,8 +968,16 @@ mdb_txn_commit(MDB_txn *txn)
/* Drop the dirty pages.
*/
for (i=1; i<=txn->mt_u.dirty_list[0].mid; i++)
free(txn->mt_u.dirty_list[i].mptr);
for (i=1; i<=txn->mt_u.dirty_list[0].mid; i++) {
dp = txn->mt_u.dirty_list[i].mptr;
if (dp->h.md_num == 1) {
dp->h.md_parent = (MDB_page *)txn->mt_env->me_dpages;
txn->mt_env->me_dpages = dp;
} else {
free(dp);
}
txn->mt_u.dirty_list[i].mid = 0;
}
if ((n = mdb_env_sync(env, 0)) != 0 ||
(n = mdb_env_write_meta(txn)) != MDB_SUCCESS) {
@ -1450,9 +1473,17 @@ leave:
void
mdb_env_close(MDB_env *env)
{
MDB_dpage *dp;
if (env == NULL)
return;
while (env->me_dpages) {
dp = env->me_dpages;
env->me_dpages = (MDB_dpage *)dp->h.md_parent;
free(dp);
}
free(env->me_dbs[1]);
free(env->me_dbs[0]);
free(env->me_dbxs);