ocfs2/dlm: Activate dlm->master_hash for master list entries
With this patch, the mles are stored in a hash and not a simple list. This should improve the mle lookup time when the number of outstanding masteries is large. Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
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@ -56,12 +56,13 @@ enum dlm_mle_type {
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};
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struct dlm_lock_name {
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unsigned int hash;
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unsigned int len;
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unsigned char name[DLM_LOCKID_NAME_MAX];
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};
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struct dlm_master_list_entry {
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struct list_head list;
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struct hlist_node master_hash_node;
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struct list_head hb_events;
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struct dlm_ctxt *dlm;
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spinlock_t spinlock;
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@ -152,7 +153,6 @@ struct dlm_ctxt
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struct dlm_recovery_ctxt reco;
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spinlock_t master_lock;
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struct hlist_head **master_hash;
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struct list_head master_list;
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struct list_head mle_hb_events;
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/* these give a really vague idea of the system load */
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@ -501,19 +501,26 @@ static struct file_operations debug_purgelist_fops = {
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static int debug_mle_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
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{
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struct dlm_master_list_entry *mle;
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int out = 0;
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struct hlist_head *bucket;
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struct hlist_node *list;
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int i, out = 0;
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unsigned long total = 0;
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out += snprintf(db->buf + out, db->len - out,
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"Dumping MLEs for Domain: %s\n", dlm->name);
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spin_lock(&dlm->master_lock);
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list_for_each_entry(mle, &dlm->master_list, list) {
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for (i = 0; i < DLM_HASH_BUCKETS; i++) {
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bucket = dlm_master_hash(dlm, i);
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hlist_for_each(list, bucket) {
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mle = hlist_entry(list, struct dlm_master_list_entry,
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master_hash_node);
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++total;
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if (db->len - out < 200)
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continue;
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out += dump_mle(mle, db->buf + out, db->len - out);
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}
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}
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spin_unlock(&dlm->master_lock);
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out += snprintf(db->buf + out, db->len - out,
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@ -813,12 +820,11 @@ static int debug_state_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
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/* Lists: Dirty=Empty Purge=InUse PendingASTs=Empty ... */
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out += snprintf(db->buf + out, db->len - out,
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"Lists: Dirty=%s Purge=%s PendingASTs=%s "
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"PendingBASTs=%s Master=%s\n",
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"PendingBASTs=%s\n",
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(list_empty(&dlm->dirty_list) ? "Empty" : "InUse"),
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(list_empty(&dlm->purge_list) ? "Empty" : "InUse"),
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(list_empty(&dlm->pending_asts) ? "Empty" : "InUse"),
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(list_empty(&dlm->pending_basts) ? "Empty" : "InUse"),
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(list_empty(&dlm->master_list) ? "Empty" : "InUse"));
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(list_empty(&dlm->pending_basts) ? "Empty" : "InUse"));
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/* Purge Count: xxx Refs: xxx */
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out += snprintf(db->buf + out, db->len - out,
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@ -1597,7 +1597,6 @@ static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain,
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init_waitqueue_head(&dlm->reco.event);
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init_waitqueue_head(&dlm->ast_wq);
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init_waitqueue_head(&dlm->migration_wq);
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INIT_LIST_HEAD(&dlm->master_list);
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INIT_LIST_HEAD(&dlm->mle_hb_events);
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dlm->joining_node = DLM_LOCK_RES_OWNER_UNKNOWN;
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@ -69,7 +69,8 @@ static int dlm_do_assert_master(struct dlm_ctxt *dlm,
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static void dlm_deref_lockres_worker(struct dlm_work_item *item, void *data);
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static inline void __dlm_mle_name(struct dlm_master_list_entry *mle,
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unsigned char **name, unsigned int *namelen)
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unsigned char **name, unsigned int *namelen,
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unsigned int *namehash)
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{
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BUG_ON(mle->type != DLM_MLE_BLOCK &&
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mle->type != DLM_MLE_MASTER &&
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@ -78,9 +79,13 @@ static inline void __dlm_mle_name(struct dlm_master_list_entry *mle,
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if (mle->type != DLM_MLE_MASTER) {
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*name = mle->u.mlename.name;
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*namelen = mle->u.mlename.len;
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if (namehash)
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*namehash = mle->u.mlename.hash;
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} else {
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*name = (unsigned char *)mle->u.mleres->lockname.name;
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*namelen = mle->u.mleres->lockname.len;
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if (namehash)
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*namehash = mle->u.mleres->lockname.hash;
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}
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}
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@ -95,7 +100,7 @@ static inline int dlm_mle_equal(struct dlm_ctxt *dlm,
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if (dlm != mle->dlm)
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return 0;
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__dlm_mle_name(mle, &mlename, &mlelen);
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__dlm_mle_name(mle, &mlename, &mlelen, NULL);
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if (namelen != mlelen || memcmp(name, mlename, namelen) != 0)
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return 0;
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@ -294,7 +299,7 @@ static void dlm_init_mle(struct dlm_master_list_entry *mle,
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mle->dlm = dlm;
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mle->type = type;
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INIT_LIST_HEAD(&mle->list);
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INIT_HLIST_NODE(&mle->master_hash_node);
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INIT_LIST_HEAD(&mle->hb_events);
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memset(mle->maybe_map, 0, sizeof(mle->maybe_map));
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spin_lock_init(&mle->spinlock);
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@ -317,6 +322,7 @@ static void dlm_init_mle(struct dlm_master_list_entry *mle,
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BUG_ON(!name);
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memcpy(mle->u.mlename.name, name, namelen);
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mle->u.mlename.len = namelen;
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mle->u.mlename.hash = dlm_lockid_hash(name, namelen);
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}
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/* copy off the node_map and register hb callbacks on our copy */
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@ -334,15 +340,21 @@ void __dlm_unlink_mle(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle)
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assert_spin_locked(&dlm->spinlock);
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assert_spin_locked(&dlm->master_lock);
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if (!list_empty(&mle->list))
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list_del_init(&mle->list);
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if (!hlist_unhashed(&mle->master_hash_node))
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hlist_del_init(&mle->master_hash_node);
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}
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void __dlm_insert_mle(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle)
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{
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struct hlist_head *bucket;
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unsigned char *mname;
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unsigned int mlen, hash;
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assert_spin_locked(&dlm->master_lock);
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list_add(&mle->list, &dlm->master_list);
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__dlm_mle_name(mle, &mname, &mlen, &hash);
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bucket = dlm_master_hash(dlm, hash);
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hlist_add_head(&mle->master_hash_node, bucket);
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}
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/* returns 1 if found, 0 if not */
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@ -351,10 +363,17 @@ static int dlm_find_mle(struct dlm_ctxt *dlm,
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char *name, unsigned int namelen)
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{
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struct dlm_master_list_entry *tmpmle;
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struct hlist_head *bucket;
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struct hlist_node *list;
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unsigned int hash;
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assert_spin_locked(&dlm->master_lock);
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list_for_each_entry(tmpmle, &dlm->master_list, list) {
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hash = dlm_lockid_hash(name, namelen);
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bucket = dlm_master_hash(dlm, hash);
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hlist_for_each(list, bucket) {
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tmpmle = hlist_entry(list, struct dlm_master_list_entry,
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master_hash_node);
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if (!dlm_mle_equal(dlm, tmpmle, name, namelen))
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continue;
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dlm_get_mle(tmpmle);
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@ -428,23 +447,20 @@ static void dlm_mle_release(struct kref *kref)
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{
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struct dlm_master_list_entry *mle;
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struct dlm_ctxt *dlm;
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unsigned char *mname;
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unsigned int mlen;
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mlog_entry_void();
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mle = container_of(kref, struct dlm_master_list_entry, mle_refs);
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dlm = mle->dlm;
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if (mle->type != DLM_MLE_MASTER) {
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mlog(0, "calling mle_release for %.*s, type %d\n",
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mle->u.mlename.len, mle->u.mlename.name, mle->type);
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} else {
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mlog(0, "calling mle_release for %.*s, type %d\n",
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mle->u.mleres->lockname.len,
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mle->u.mleres->lockname.name, mle->type);
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}
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assert_spin_locked(&dlm->spinlock);
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assert_spin_locked(&dlm->master_lock);
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__dlm_mle_name(mle, &mname, &mlen, NULL);
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mlog(0, "Releasing mle for %.*s, type %d\n", mlen, mname, mle->type);
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/* remove from list if not already */
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__dlm_unlink_mle(dlm, mle);
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@ -1342,7 +1358,7 @@ static int dlm_do_master_request(struct dlm_lock_resource *res,
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BUG_ON(mle->type == DLM_MLE_MIGRATION);
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__dlm_mle_name(mle, &mlename, &mlenamelen);
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__dlm_mle_name(mle, &mlename, &mlenamelen, NULL);
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request.namelen = (u8)mlenamelen;
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memcpy(request.name, mlename, request.namelen);
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@ -3286,8 +3302,11 @@ static void dlm_clean_block_mle(struct dlm_ctxt *dlm,
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void dlm_clean_master_list(struct dlm_ctxt *dlm, u8 dead_node)
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{
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struct dlm_master_list_entry *mle, *next;
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struct dlm_master_list_entry *mle;
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struct dlm_lock_resource *res;
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struct hlist_head *bucket;
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struct hlist_node *list;
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unsigned int i;
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mlog_entry("dlm=%s, dead node=%u\n", dlm->name, dead_node);
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top:
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@ -3295,7 +3314,12 @@ top:
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/* clean the master list */
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spin_lock(&dlm->master_lock);
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list_for_each_entry_safe(mle, next, &dlm->master_list, list) {
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for (i = 0; i < DLM_HASH_BUCKETS; i++) {
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bucket = dlm_master_hash(dlm, i);
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hlist_for_each(list, bucket) {
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mle = hlist_entry(list, struct dlm_master_list_entry,
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master_hash_node);
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BUG_ON(mle->type != DLM_MLE_BLOCK &&
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mle->type != DLM_MLE_MASTER &&
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mle->type != DLM_MLE_MIGRATION);
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@ -3351,6 +3375,7 @@ top:
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/* this may be the last reference */
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__dlm_put_mle(mle);
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}
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}
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spin_unlock(&dlm->master_lock);
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}
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