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authorBob Peterson <rpeterso@redhat.com>2011-10-26 15:24:55 -0500
committerDavid Teigland <teigland@redhat.com>2011-11-18 10:20:15 -0600
commit9beb3bf5a92bb8fc6503f844bf0772df29f14a02 (patch)
treec60963c27d0a93ae1f572e6fda9c090a4a702d4e /fs/dlm/recover.c
parentc3b92c8787367a8bb53d57d9789b558f1295cc96 (diff)
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>
Diffstat (limited to 'fs/dlm/recover.c')
-rw-r--r--fs/dlm/recover.c21
1 files changed, 13 insertions, 8 deletions
diff --git a/fs/dlm/recover.c b/fs/dlm/recover.c
index 14638235f7b..50467cefdbd 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);