From 2ed6c750d645d09b5948e46fada3ca1fda3157b5 Mon Sep 17 00:00:00 2001 From: Sunil Mushran Date: Thu, 26 Feb 2009 15:00:41 -0800 Subject: [PATCH] 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 Signed-off-by: Mark Fasheh --- fs/ocfs2/dlm/dlmcommon.h | 4 +-- fs/ocfs2/dlm/dlmdebug.c | 24 ++++++++++------ fs/ocfs2/dlm/dlmdomain.c | 1 - fs/ocfs2/dlm/dlmmaster.c | 61 ++++++++++++++++++++++++++++------------ 4 files changed, 60 insertions(+), 30 deletions(-) diff --git a/fs/ocfs2/dlm/dlmcommon.h b/fs/ocfs2/dlm/dlmcommon.h index 425653f88e98..aa55271a7aca 100644 --- a/fs/ocfs2/dlm/dlmcommon.h +++ b/fs/ocfs2/dlm/dlmcommon.h @@ -56,12 +56,13 @@ enum dlm_mle_type { }; struct dlm_lock_name { + unsigned int hash; unsigned int len; unsigned char name[DLM_LOCKID_NAME_MAX]; }; struct dlm_master_list_entry { - struct list_head list; + struct hlist_node master_hash_node; struct list_head hb_events; struct dlm_ctxt *dlm; spinlock_t spinlock; @@ -152,7 +153,6 @@ struct dlm_ctxt struct dlm_recovery_ctxt reco; spinlock_t master_lock; struct hlist_head **master_hash; - struct list_head master_list; struct list_head mle_hb_events; /* these give a really vague idea of the system load */ diff --git a/fs/ocfs2/dlm/dlmdebug.c b/fs/ocfs2/dlm/dlmdebug.c index c82feb7b00b9..336a98e82eba 100644 --- a/fs/ocfs2/dlm/dlmdebug.c +++ b/fs/ocfs2/dlm/dlmdebug.c @@ -501,18 +501,25 @@ static struct file_operations debug_purgelist_fops = { static int debug_mle_print(struct dlm_ctxt *dlm, struct debug_buffer *db) { struct dlm_master_list_entry *mle; - int out = 0; + struct hlist_head *bucket; + struct hlist_node *list; + int i, out = 0; unsigned long total = 0; out += snprintf(db->buf + out, db->len - out, "Dumping MLEs for Domain: %s\n", dlm->name); spin_lock(&dlm->master_lock); - list_for_each_entry(mle, &dlm->master_list, list) { - ++total; - if (db->len - out < 200) - continue; - out += dump_mle(mle, db->buf + out, db->len - out); + for (i = 0; i < DLM_HASH_BUCKETS; i++) { + bucket = dlm_master_hash(dlm, i); + hlist_for_each(list, bucket) { + mle = hlist_entry(list, struct dlm_master_list_entry, + master_hash_node); + ++total; + if (db->len - out < 200) + continue; + out += dump_mle(mle, db->buf + out, db->len - out); + } } spin_unlock(&dlm->master_lock); @@ -813,12 +820,11 @@ static int debug_state_print(struct dlm_ctxt *dlm, struct debug_buffer *db) /* Lists: Dirty=Empty Purge=InUse PendingASTs=Empty ... */ out += snprintf(db->buf + out, db->len - out, "Lists: Dirty=%s Purge=%s PendingASTs=%s " - "PendingBASTs=%s Master=%s\n", + "PendingBASTs=%s\n", (list_empty(&dlm->dirty_list) ? "Empty" : "InUse"), (list_empty(&dlm->purge_list) ? "Empty" : "InUse"), (list_empty(&dlm->pending_asts) ? "Empty" : "InUse"), - (list_empty(&dlm->pending_basts) ? "Empty" : "InUse"), - (list_empty(&dlm->master_list) ? "Empty" : "InUse")); + (list_empty(&dlm->pending_basts) ? "Empty" : "InUse")); /* Purge Count: xxx Refs: xxx */ out += snprintf(db->buf + out, db->len - out, diff --git a/fs/ocfs2/dlm/dlmdomain.c b/fs/ocfs2/dlm/dlmdomain.c index 45315046daf5..869648c61041 100644 --- a/fs/ocfs2/dlm/dlmdomain.c +++ b/fs/ocfs2/dlm/dlmdomain.c @@ -1597,7 +1597,6 @@ static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain, init_waitqueue_head(&dlm->reco.event); init_waitqueue_head(&dlm->ast_wq); init_waitqueue_head(&dlm->migration_wq); - INIT_LIST_HEAD(&dlm->master_list); INIT_LIST_HEAD(&dlm->mle_hb_events); dlm->joining_node = DLM_LOCK_RES_OWNER_UNKNOWN; diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c index ec6da3c37dc8..804558174a77 100644 --- a/fs/ocfs2/dlm/dlmmaster.c +++ b/fs/ocfs2/dlm/dlmmaster.c @@ -69,7 +69,8 @@ static int dlm_do_assert_master(struct dlm_ctxt *dlm, static void dlm_deref_lockres_worker(struct dlm_work_item *item, void *data); static inline void __dlm_mle_name(struct dlm_master_list_entry *mle, - unsigned char **name, unsigned int *namelen) + unsigned char **name, unsigned int *namelen, + unsigned int *namehash) { BUG_ON(mle->type != DLM_MLE_BLOCK && mle->type != DLM_MLE_MASTER && @@ -78,9 +79,13 @@ static inline void __dlm_mle_name(struct dlm_master_list_entry *mle, if (mle->type != DLM_MLE_MASTER) { *name = mle->u.mlename.name; *namelen = mle->u.mlename.len; + if (namehash) + *namehash = mle->u.mlename.hash; } else { *name = (unsigned char *)mle->u.mleres->lockname.name; *namelen = mle->u.mleres->lockname.len; + if (namehash) + *namehash = mle->u.mleres->lockname.hash; } } @@ -95,7 +100,7 @@ static inline int dlm_mle_equal(struct dlm_ctxt *dlm, if (dlm != mle->dlm) return 0; - __dlm_mle_name(mle, &mlename, &mlelen); + __dlm_mle_name(mle, &mlename, &mlelen, NULL); if (namelen != mlelen || memcmp(name, mlename, namelen) != 0) return 0; @@ -294,7 +299,7 @@ static void dlm_init_mle(struct dlm_master_list_entry *mle, mle->dlm = dlm; mle->type = type; - INIT_LIST_HEAD(&mle->list); + INIT_HLIST_NODE(&mle->master_hash_node); INIT_LIST_HEAD(&mle->hb_events); memset(mle->maybe_map, 0, sizeof(mle->maybe_map)); spin_lock_init(&mle->spinlock); @@ -317,6 +322,7 @@ static void dlm_init_mle(struct dlm_master_list_entry *mle, BUG_ON(!name); memcpy(mle->u.mlename.name, name, namelen); mle->u.mlename.len = namelen; + mle->u.mlename.hash = dlm_lockid_hash(name, namelen); } /* copy off the node_map and register hb callbacks on our copy */ @@ -334,15 +340,21 @@ void __dlm_unlink_mle(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle) assert_spin_locked(&dlm->spinlock); assert_spin_locked(&dlm->master_lock); - if (!list_empty(&mle->list)) - list_del_init(&mle->list); + if (!hlist_unhashed(&mle->master_hash_node)) + hlist_del_init(&mle->master_hash_node); } void __dlm_insert_mle(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle) { + struct hlist_head *bucket; + unsigned char *mname; + unsigned int mlen, hash; + assert_spin_locked(&dlm->master_lock); - list_add(&mle->list, &dlm->master_list); + __dlm_mle_name(mle, &mname, &mlen, &hash); + bucket = dlm_master_hash(dlm, hash); + hlist_add_head(&mle->master_hash_node, bucket); } /* returns 1 if found, 0 if not */ @@ -351,10 +363,17 @@ static int dlm_find_mle(struct dlm_ctxt *dlm, char *name, unsigned int namelen) { struct dlm_master_list_entry *tmpmle; + struct hlist_head *bucket; + struct hlist_node *list; + unsigned int hash; assert_spin_locked(&dlm->master_lock); - list_for_each_entry(tmpmle, &dlm->master_list, list) { + hash = dlm_lockid_hash(name, namelen); + bucket = dlm_master_hash(dlm, hash); + hlist_for_each(list, bucket) { + tmpmle = hlist_entry(list, struct dlm_master_list_entry, + master_hash_node); if (!dlm_mle_equal(dlm, tmpmle, name, namelen)) continue; dlm_get_mle(tmpmle); @@ -428,23 +447,20 @@ static void dlm_mle_release(struct kref *kref) { struct dlm_master_list_entry *mle; struct dlm_ctxt *dlm; + unsigned char *mname; + unsigned int mlen; mlog_entry_void(); mle = container_of(kref, struct dlm_master_list_entry, mle_refs); dlm = mle->dlm; - if (mle->type != DLM_MLE_MASTER) { - mlog(0, "calling mle_release for %.*s, type %d\n", - mle->u.mlename.len, mle->u.mlename.name, mle->type); - } else { - mlog(0, "calling mle_release for %.*s, type %d\n", - mle->u.mleres->lockname.len, - mle->u.mleres->lockname.name, mle->type); - } assert_spin_locked(&dlm->spinlock); assert_spin_locked(&dlm->master_lock); + __dlm_mle_name(mle, &mname, &mlen, NULL); + mlog(0, "Releasing mle for %.*s, type %d\n", mlen, mname, mle->type); + /* remove from list if not already */ __dlm_unlink_mle(dlm, mle); @@ -1342,7 +1358,7 @@ static int dlm_do_master_request(struct dlm_lock_resource *res, BUG_ON(mle->type == DLM_MLE_MIGRATION); - __dlm_mle_name(mle, &mlename, &mlenamelen); + __dlm_mle_name(mle, &mlename, &mlenamelen, NULL); request.namelen = (u8)mlenamelen; memcpy(request.name, mlename, request.namelen); @@ -3286,8 +3302,11 @@ static void dlm_clean_block_mle(struct dlm_ctxt *dlm, void dlm_clean_master_list(struct dlm_ctxt *dlm, u8 dead_node) { - struct dlm_master_list_entry *mle, *next; + struct dlm_master_list_entry *mle; struct dlm_lock_resource *res; + struct hlist_head *bucket; + struct hlist_node *list; + unsigned int i; mlog_entry("dlm=%s, dead node=%u\n", dlm->name, dead_node); top: @@ -3295,7 +3314,12 @@ void dlm_clean_master_list(struct dlm_ctxt *dlm, u8 dead_node) /* clean the master list */ spin_lock(&dlm->master_lock); - list_for_each_entry_safe(mle, next, &dlm->master_list, list) { + for (i = 0; i < DLM_HASH_BUCKETS; i++) { + bucket = dlm_master_hash(dlm, i); + hlist_for_each(list, bucket) { + mle = hlist_entry(list, struct dlm_master_list_entry, + master_hash_node); + BUG_ON(mle->type != DLM_MLE_BLOCK && mle->type != DLM_MLE_MASTER && mle->type != DLM_MLE_MIGRATION); @@ -3351,6 +3375,7 @@ void dlm_clean_master_list(struct dlm_ctxt *dlm, u8 dead_node) /* this may be the last reference */ __dlm_put_mle(mle); } + } spin_unlock(&dlm->master_lock); } -- GitLab