[Ocfs2-devel] [PATCH 21/32] ocfs2/dlm: Activate dlm->master_hash for master list entries
Mark Fasheh
mfasheh at suse.com
Tue Mar 17 13:01:11 PDT 2009
From: Sunil Mushran <sunil.mushran at oracle.com>
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 at oracle.com>
Signed-off-by: Mark Fasheh <mfasheh at suse.com>
---
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 425653f..aa55271 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 c82feb7..336a98e 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 4531504..869648c 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 ec6da3c..8045581 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 @@ top:
/* 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 @@ top:
/* this may be the last reference */
__dlm_put_mle(mle);
}
+ }
spin_unlock(&dlm->master_lock);
}
--
1.5.6
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