sin/samba-mirror
1
0
Fork 0
mirror of https://github.com/samba-team/samba.git synced 2024-12-22 13:34:15 +03:00
Code

ctdb-locking: Instead of comparing key, compare key hash

Browse Source 
This replaces memory comparison of the key with integer comparison.
In addition, this also avoids scheduling locks with the same hash.

Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Martin Schwenke <martin@meltin.net>

Autobuild-User(master): Martin Schwenke <martins@samba.org>
Autobuild-Date(master): Fri Mar 28 05:28:58 CET 2014 on sn-devel-104
This commit is contained in:
Amitay Isaacs 2014-03-10 19:10:29 +11:00 committed by Martin Schwenke
parent d1c8f8d635
commit f99a759ce7
1 changed files with 6 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
ctdb/server/ctdb_lock.c
View File

@ -79,6 +79,7 @@ struct lock_context {
pid_t block_child;
int block_fd[2];
struct timeval start_time;
uint32_t key_hash;
};
/* lock_request is the client specific part for a lock request */
@ -672,7 +673,8 @@ static struct lock_context *find_lock_context(struct lock_context *lock_list,
struct ctdb_db_context *ctdb_db,
TDB_DATA key,
uint32_t priority,
enum lock_type type)
enum lock_type type,
uint32_t key_hash)
{
struct lock_context *lock_ctx;
@ -685,8 +687,7 @@ static struct lock_context *find_lock_context(struct lock_context *lock_list,
switch (lock_ctx->type) {
case LOCK_RECORD:
if (ctdb_db == lock_ctx->ctdb_db &&
key.dsize == lock_ctx->key.dsize &&
memcmp(key.dptr, lock_ctx->key.dptr, key.dsize) == 0) {
key_hash == lock_ctx->key_hash) {
goto done;
}
break;
@ -763,7 +764,7 @@ static void ctdb_lock_schedule(struct ctdb_context *ctdb)
} else {
active_ctx = find_lock_context(ctdb->lock_current, lock_ctx->ctdb_db,
lock_ctx->key, lock_ctx->priority,
lock_ctx->type);
lock_ctx->type, lock_ctx->key_hash);
if (active_ctx == NULL) {
if (lock_ctx->ctdb_db == NULL ||
lock_ctx->ctdb_db->lock_num_current < MAX_LOCK_PROCESSES_PER_DB) {
@ -932,6 +933,7 @@ static struct lock_request *ctdb_lock_internal(struct ctdb_context *ctdb,
talloc_free(lock_ctx);
return NULL;
}
lock_ctx->key_hash = ctdb_hash(&key);
} else {
lock_ctx->key.dptr = NULL;
}