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Message-Id: <1325781857-7938-2-git-send-email-teigland@redhat.com>
Date: Thu, 5 Jan 2012 10:44:13 -0600
From: David Teigland <teigland@...hat.com>
To: linux-kernel@...r.kernel.org
Subject: [PATCH 1/5] dlm: convert rsb list to rb_tree
From: Bob Peterson <rpeterso@...hat.com>
Change the linked lists to rb_tree's in the rsb
hash table to speed up searches. Slow rsb searches
were having a large impact on gfs2 performance due
to the large number of dlm locks gfs2 uses.
Signed-off-by: Bob Peterson <rpeterso@...hat.com>
Signed-off-by: David Teigland <teigland@...hat.com>
---
fs/dlm/debug_fs.c | 28 ++++++++-------
fs/dlm/dlm_internal.h | 9 +++--
fs/dlm/lock.c | 87 +++++++++++++++++++++++++++++++++++++++---------
fs/dlm/lockspace.c | 23 +++++--------
fs/dlm/recover.c | 21 +++++++----
5 files changed, 113 insertions(+), 55 deletions(-)
diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c
index 5977923..3dca2b3 100644
--- a/fs/dlm/debug_fs.c
+++ b/fs/dlm/debug_fs.c
@@ -393,6 +393,7 @@ static const struct seq_operations format3_seq_ops;
static void *table_seq_start(struct seq_file *seq, loff_t *pos)
{
+ struct rb_node *node;
struct dlm_ls *ls = seq->private;
struct rsbtbl_iter *ri;
struct dlm_rsb *r;
@@ -418,9 +419,10 @@ static void *table_seq_start(struct seq_file *seq, loff_t *pos)
ri->format = 3;
spin_lock(&ls->ls_rsbtbl[bucket].lock);
- if (!list_empty(&ls->ls_rsbtbl[bucket].list)) {
- list_for_each_entry(r, &ls->ls_rsbtbl[bucket].list,
- res_hashchain) {
+ if (!RB_EMPTY_ROOT(&ls->ls_rsbtbl[bucket].keep)) {
+ for (node = rb_first(&ls->ls_rsbtbl[bucket].keep); node;
+ node = rb_next(node)) {
+ r = rb_entry(node, struct dlm_rsb, res_hashnode);
if (!entry--) {
dlm_hold_rsb(r);
ri->rsb = r;
@@ -449,9 +451,9 @@ static void *table_seq_start(struct seq_file *seq, loff_t *pos)
}
spin_lock(&ls->ls_rsbtbl[bucket].lock);
- if (!list_empty(&ls->ls_rsbtbl[bucket].list)) {
- r = list_first_entry(&ls->ls_rsbtbl[bucket].list,
- struct dlm_rsb, res_hashchain);
+ if (!RB_EMPTY_ROOT(&ls->ls_rsbtbl[bucket].keep)) {
+ node = rb_first(&ls->ls_rsbtbl[bucket].keep);
+ r = rb_entry(node, struct dlm_rsb, res_hashnode);
dlm_hold_rsb(r);
ri->rsb = r;
ri->bucket = bucket;
@@ -467,7 +469,7 @@ static void *table_seq_next(struct seq_file *seq, void *iter_ptr, loff_t *pos)
{
struct dlm_ls *ls = seq->private;
struct rsbtbl_iter *ri = iter_ptr;
- struct list_head *next;
+ struct rb_node *next;
struct dlm_rsb *r, *rp;
loff_t n = *pos;
unsigned bucket;
@@ -480,10 +482,10 @@ static void *table_seq_next(struct seq_file *seq, void *iter_ptr, loff_t *pos)
spin_lock(&ls->ls_rsbtbl[bucket].lock);
rp = ri->rsb;
- next = rp->res_hashchain.next;
+ next = rb_next(&rp->res_hashnode);
- if (next != &ls->ls_rsbtbl[bucket].list) {
- r = list_entry(next, struct dlm_rsb, res_hashchain);
+ if (next) {
+ r = rb_entry(next, struct dlm_rsb, res_hashnode);
dlm_hold_rsb(r);
ri->rsb = r;
spin_unlock(&ls->ls_rsbtbl[bucket].lock);
@@ -511,9 +513,9 @@ static void *table_seq_next(struct seq_file *seq, void *iter_ptr, loff_t *pos)
}
spin_lock(&ls->ls_rsbtbl[bucket].lock);
- if (!list_empty(&ls->ls_rsbtbl[bucket].list)) {
- r = list_first_entry(&ls->ls_rsbtbl[bucket].list,
- struct dlm_rsb, res_hashchain);
+ if (!RB_EMPTY_ROOT(&ls->ls_rsbtbl[bucket].keep)) {
+ next = rb_first(&ls->ls_rsbtbl[bucket].keep);
+ r = rb_entry(next, struct dlm_rsb, res_hashnode);
dlm_hold_rsb(r);
ri->rsb = r;
ri->bucket = bucket;
diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index fe2860c..5685a9a 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -103,8 +103,8 @@ struct dlm_dirtable {
};
struct dlm_rsbtable {
- struct list_head list;
- struct list_head toss;
+ struct rb_root keep;
+ struct rb_root toss;
spinlock_t lock;
};
@@ -285,7 +285,10 @@ struct dlm_rsb {
unsigned long res_toss_time;
uint32_t res_first_lkid;
struct list_head res_lookup; /* lkbs waiting on first */
- struct list_head res_hashchain; /* rsbtbl */
+ union {
+ struct list_head res_hashchain;
+ struct rb_node res_hashnode; /* rsbtbl */
+ };
struct list_head res_grantqueue;
struct list_head res_convertqueue;
struct list_head res_waitqueue;
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 83b5e32..d471830 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -56,6 +56,7 @@
L: receive_xxxx_reply() <- R: send_xxxx_reply()
*/
#include <linux/types.h>
+#include <linux/rbtree.h>
#include <linux/slab.h>
#include "dlm_internal.h"
#include <linux/dlm_device.h>
@@ -380,6 +381,8 @@ static int get_rsb_struct(struct dlm_ls *ls, char *name, int len,
r = list_first_entry(&ls->ls_new_rsb, struct dlm_rsb, res_hashchain);
list_del(&r->res_hashchain);
+ /* Convert the empty list_head to a NULL rb_node for tree usage: */
+ memset(&r->res_hashnode, 0, sizeof(struct rb_node));
ls->ls_new_rsb_count--;
spin_unlock(&ls->ls_new_rsb_spin);
@@ -388,7 +391,6 @@ static int get_rsb_struct(struct dlm_ls *ls, char *name, int len,
memcpy(r->res_name, name, len);
mutex_init(&r->res_mutex);
- INIT_LIST_HEAD(&r->res_hashchain);
INIT_LIST_HEAD(&r->res_lookup);
INIT_LIST_HEAD(&r->res_grantqueue);
INIT_LIST_HEAD(&r->res_convertqueue);
@@ -400,14 +402,31 @@ static int get_rsb_struct(struct dlm_ls *ls, char *name, int len,
return 0;
}
-static int search_rsb_list(struct list_head *head, char *name, int len,
+static int rsb_cmp(struct dlm_rsb *r, const char *name, int nlen)
+{
+ char maxname[DLM_RESNAME_MAXLEN];
+
+ memset(maxname, 0, DLM_RESNAME_MAXLEN);
+ memcpy(maxname, name, nlen);
+ return memcmp(r->res_name, maxname, DLM_RESNAME_MAXLEN);
+}
+
+static int search_rsb_tree(struct rb_root *tree, char *name, int len,
unsigned int flags, struct dlm_rsb **r_ret)
{
+ struct rb_node *node = tree->rb_node;
struct dlm_rsb *r;
int error = 0;
-
- list_for_each_entry(r, head, res_hashchain) {
- if (len == r->res_length && !memcmp(name, r->res_name, len))
+ int rc;
+
+ while (node) {
+ r = rb_entry(node, struct dlm_rsb, res_hashnode);
+ rc = rsb_cmp(r, name, len);
+ if (rc < 0)
+ node = node->rb_left;
+ else if (rc > 0)
+ node = node->rb_right;
+ else
goto found;
}
*r_ret = NULL;
@@ -420,22 +439,54 @@ static int search_rsb_list(struct list_head *head, char *name, int len,
return error;
}
+static int rsb_insert(struct dlm_rsb *rsb, struct rb_root *tree)
+{
+ struct rb_node **newn = &tree->rb_node;
+ struct rb_node *parent = NULL;
+ int rc;
+
+ while (*newn) {
+ struct dlm_rsb *cur = rb_entry(*newn, struct dlm_rsb,
+ res_hashnode);
+
+ parent = *newn;
+ rc = rsb_cmp(cur, rsb->res_name, rsb->res_length);
+ if (rc < 0)
+ newn = &parent->rb_left;
+ else if (rc > 0)
+ newn = &parent->rb_right;
+ else {
+ log_print("rsb_insert match");
+ dlm_dump_rsb(rsb);
+ dlm_dump_rsb(cur);
+ return -EEXIST;
+ }
+ }
+
+ rb_link_node(&rsb->res_hashnode, parent, newn);
+ rb_insert_color(&rsb->res_hashnode, tree);
+ return 0;
+}
+
static int _search_rsb(struct dlm_ls *ls, char *name, int len, int b,
unsigned int flags, struct dlm_rsb **r_ret)
{
struct dlm_rsb *r;
int error;
- error = search_rsb_list(&ls->ls_rsbtbl[b].list, name, len, flags, &r);
+ error = search_rsb_tree(&ls->ls_rsbtbl[b].keep, name, len, flags, &r);
if (!error) {
kref_get(&r->res_ref);
goto out;
}
- error = search_rsb_list(&ls->ls_rsbtbl[b].toss, name, len, flags, &r);
+ error = search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, flags, &r);
if (error)
goto out;
- list_move(&r->res_hashchain, &ls->ls_rsbtbl[b].list);
+ rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[b].toss);
+ error = rsb_insert(r, &ls->ls_rsbtbl[b].keep);
+ if (error)
+ return error;
if (dlm_no_directory(ls))
goto out;
@@ -527,8 +578,7 @@ static int find_rsb(struct dlm_ls *ls, char *name, int namelen,
nodeid = 0;
r->res_nodeid = nodeid;
}
- list_add(&r->res_hashchain, &ls->ls_rsbtbl[bucket].list);
- error = 0;
+ error = rsb_insert(r, &ls->ls_rsbtbl[bucket].keep);
out_unlock:
spin_unlock(&ls->ls_rsbtbl[bucket].lock);
out:
@@ -556,7 +606,8 @@ static void toss_rsb(struct kref *kref)
DLM_ASSERT(list_empty(&r->res_root_list), dlm_print_rsb(r););
kref_init(&r->res_ref);
- list_move(&r->res_hashchain, &ls->ls_rsbtbl[r->res_bucket].toss);
+ rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[r->res_bucket].keep);
+ rsb_insert(r, &ls->ls_rsbtbl[r->res_bucket].toss);
r->res_toss_time = jiffies;
if (r->res_lvbptr) {
dlm_free_lvb(r->res_lvbptr);
@@ -1082,19 +1133,19 @@ static void dir_remove(struct dlm_rsb *r)
r->res_name, r->res_length);
}
-/* FIXME: shouldn't this be able to exit as soon as one non-due rsb is
- found since they are in order of newest to oldest? */
+/* FIXME: make this more efficient */
static int shrink_bucket(struct dlm_ls *ls, int b)
{
+ struct rb_node *n;
struct dlm_rsb *r;
int count = 0, found;
for (;;) {
found = 0;
spin_lock(&ls->ls_rsbtbl[b].lock);
- list_for_each_entry_reverse(r, &ls->ls_rsbtbl[b].toss,
- res_hashchain) {
+ for (n = rb_first(&ls->ls_rsbtbl[b].toss); n; n = rb_next(n)) {
+ r = rb_entry(n, struct dlm_rsb, res_hashnode);
if (!time_after_eq(jiffies, r->res_toss_time +
dlm_config.ci_toss_secs * HZ))
continue;
@@ -1108,7 +1159,7 @@ static int shrink_bucket(struct dlm_ls *ls, int b)
}
if (kref_put(&r->res_ref, kill_rsb)) {
- list_del(&r->res_hashchain);
+ rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[b].toss);
spin_unlock(&ls->ls_rsbtbl[b].lock);
if (is_master(r))
@@ -4441,10 +4492,12 @@ int dlm_purge_locks(struct dlm_ls *ls)
static struct dlm_rsb *find_purged_rsb(struct dlm_ls *ls, int bucket)
{
+ struct rb_node *n;
struct dlm_rsb *r, *r_ret = NULL;
spin_lock(&ls->ls_rsbtbl[bucket].lock);
- list_for_each_entry(r, &ls->ls_rsbtbl[bucket].list, res_hashchain) {
+ for (n = rb_first(&ls->ls_rsbtbl[bucket].keep); n; n = rb_next(n)) {
+ r = rb_entry(n, struct dlm_rsb, res_hashnode);
if (!rsb_flag(r, RSB_LOCKS_PURGED))
continue;
hold_rsb(r);
diff --git a/fs/dlm/lockspace.c b/fs/dlm/lockspace.c
index a1d8f1a..1d16a23 100644
--- a/fs/dlm/lockspace.c
+++ b/fs/dlm/lockspace.c
@@ -457,8 +457,8 @@ static int new_lockspace(const char *name, int namelen, void **lockspace,
if (!ls->ls_rsbtbl)
goto out_lsfree;
for (i = 0; i < size; i++) {
- INIT_LIST_HEAD(&ls->ls_rsbtbl[i].list);
- INIT_LIST_HEAD(&ls->ls_rsbtbl[i].toss);
+ ls->ls_rsbtbl[i].keep.rb_node = NULL;
+ ls->ls_rsbtbl[i].toss.rb_node = NULL;
spin_lock_init(&ls->ls_rsbtbl[i].lock);
}
@@ -685,7 +685,7 @@ static int lockspace_busy(struct dlm_ls *ls, int force)
static int release_lockspace(struct dlm_ls *ls, int force)
{
struct dlm_rsb *rsb;
- struct list_head *head;
+ struct rb_node *n;
int i, busy, rv;
busy = lockspace_busy(ls, force);
@@ -746,20 +746,15 @@ static int release_lockspace(struct dlm_ls *ls, int force)
*/
for (i = 0; i < ls->ls_rsbtbl_size; i++) {
- head = &ls->ls_rsbtbl[i].list;
- while (!list_empty(head)) {
- rsb = list_entry(head->next, struct dlm_rsb,
- res_hashchain);
-
- list_del(&rsb->res_hashchain);
+ while ((n = rb_first(&ls->ls_rsbtbl[i].keep))) {
+ rsb = rb_entry(n, struct dlm_rsb, res_hashnode);
+ rb_erase(n, &ls->ls_rsbtbl[i].keep);
dlm_free_rsb(rsb);
}
- head = &ls->ls_rsbtbl[i].toss;
- while (!list_empty(head)) {
- rsb = list_entry(head->next, struct dlm_rsb,
- res_hashchain);
- list_del(&rsb->res_hashchain);
+ while ((n = rb_first(&ls->ls_rsbtbl[i].toss))) {
+ rsb = rb_entry(n, struct dlm_rsb, res_hashnode);
+ rb_erase(n, &ls->ls_rsbtbl[i].toss);
dlm_free_rsb(rsb);
}
}
diff --git a/fs/dlm/recover.c b/fs/dlm/recover.c
index 1463823..50467ce 100644
--- a/fs/dlm/recover.c
+++ b/fs/dlm/recover.c
@@ -715,6 +715,7 @@ void dlm_recover_rsbs(struct dlm_ls *ls)
int dlm_create_root_list(struct dlm_ls *ls)
{
+ struct rb_node *n;
struct dlm_rsb *r;
int i, error = 0;
@@ -727,7 +728,8 @@ int dlm_create_root_list(struct dlm_ls *ls)
for (i = 0; i < ls->ls_rsbtbl_size; i++) {
spin_lock(&ls->ls_rsbtbl[i].lock);
- list_for_each_entry(r, &ls->ls_rsbtbl[i].list, res_hashchain) {
+ for (n = rb_first(&ls->ls_rsbtbl[i].keep); n; n = rb_next(n)) {
+ r = rb_entry(n, struct dlm_rsb, res_hashnode);
list_add(&r->res_root_list, &ls->ls_root_list);
dlm_hold_rsb(r);
}
@@ -741,7 +743,8 @@ int dlm_create_root_list(struct dlm_ls *ls)
continue;
}
- list_for_each_entry(r, &ls->ls_rsbtbl[i].toss, res_hashchain) {
+ for (n = rb_first(&ls->ls_rsbtbl[i].toss); n; n = rb_next(n)) {
+ r = rb_entry(n, struct dlm_rsb, res_hashnode);
list_add(&r->res_root_list, &ls->ls_root_list);
dlm_hold_rsb(r);
}
@@ -771,16 +774,18 @@ void dlm_release_root_list(struct dlm_ls *ls)
void dlm_clear_toss_list(struct dlm_ls *ls)
{
- struct dlm_rsb *r, *safe;
+ struct rb_node *n, *next;
+ struct dlm_rsb *rsb;
int i;
for (i = 0; i < ls->ls_rsbtbl_size; i++) {
spin_lock(&ls->ls_rsbtbl[i].lock);
- list_for_each_entry_safe(r, safe, &ls->ls_rsbtbl[i].toss,
- res_hashchain) {
- if (dlm_no_directory(ls) || !is_master(r)) {
- list_del(&r->res_hashchain);
- dlm_free_rsb(r);
+ for (n = rb_first(&ls->ls_rsbtbl[i].toss); n; n = next) {
+ next = rb_next(n);;
+ rsb = rb_entry(n, struct dlm_rsb, res_hashnode);
+ if (dlm_no_directory(ls) || !is_master(rsb)) {
+ rb_erase(n, &ls->ls_rsbtbl[i].toss);
+ dlm_free_rsb(rsb);
}
}
spin_unlock(&ls->ls_rsbtbl[i].lock);
--
1.7.6
--
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