dlm: convert rsb list to rb_tree
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@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
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 @@
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 @@
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 @@
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_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);