ocfs2: calculate lockid hash values outside of the spinlock
Fixes a performance bug - pointed out by Andrew.
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
diff --git a/fs/ocfs2/dlm/dlmdomain.c b/fs/ocfs2/dlm/dlmdomain.c
index 8f3a9e3..a818fde 100644
--- a/fs/ocfs2/dlm/dlmdomain.c
+++ b/fs/ocfs2/dlm/dlmdomain.c
@@ -90,7 +90,6 @@
assert_spin_locked(&dlm->spinlock);
q = &res->lockname;
- q->hash = full_name_hash(q->name, q->len);
bucket = &(dlm->lockres_hash[q->hash % DLM_HASH_BUCKETS]);
/* get a reference for our hashtable */
@@ -100,10 +99,10 @@
}
struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
- const char *name,
- unsigned int len)
+ const char *name,
+ unsigned int len,
+ unsigned int hash)
{
- unsigned int hash;
struct hlist_node *iter;
struct dlm_lock_resource *tmpres=NULL;
struct hlist_head *bucket;
@@ -112,8 +111,6 @@
assert_spin_locked(&dlm->spinlock);
- hash = full_name_hash(name, len);
-
bucket = &(dlm->lockres_hash[hash % DLM_HASH_BUCKETS]);
/* check for pre-existing lock */
@@ -135,9 +132,10 @@
unsigned int len)
{
struct dlm_lock_resource *res;
+ unsigned int hash = dlm_lockid_hash(name, len);
spin_lock(&dlm->spinlock);
- res = __dlm_lookup_lockres(dlm, name, len);
+ res = __dlm_lookup_lockres(dlm, name, len, hash);
spin_unlock(&dlm->spinlock);
return res;
}
