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authorDavid Teigland <teigland@redhat.com>2013-01-07 11:03:42 -0600
committerDavid Teigland <teigland@redhat.com>2013-01-07 12:02:49 -0600
commitf11722834605a155022a8098ad7d8adacf44b22f (patch)
tree9a2004fa6c4a925971c338db5af8f643a990f2d8 /fs/dlm/lock.c
parent2318aa272072f6906de8e00a332da1485506b3c5 (diff)
downloadlinux-linaro-stable-f11722834605a155022a8098ad7d8adacf44b22f.tar.gz
dlm: avoid scanning unchanged toss lists
Keep track of whether a toss list contains any shrinkable rsbs. If not, dlm_scand can avoid scanning the list for rsbs to shrink. Unnecessary scanning can otherwise waste a lot of time because the toss lists can contain a large number of rsbs that are non-shrinkable (directory records). Signed-off-by: David Teigland <teigland@redhat.com>
Diffstat (limited to 'fs/dlm/lock.c')
-rw-r--r--fs/dlm/lock.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index a579f30f237d..f7501651762d 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -1132,6 +1132,7 @@ static void toss_rsb(struct kref *kref)
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;
+ ls->ls_rsbtbl[r->res_bucket].flags |= DLM_RTF_SHRINK;
if (r->res_lvbptr) {
dlm_free_lvb(r->res_lvbptr);
r->res_lvbptr = NULL;
@@ -1659,11 +1660,18 @@ static void shrink_bucket(struct dlm_ls *ls, int b)
char *name;
int our_nodeid = dlm_our_nodeid();
int remote_count = 0;
+ int need_shrink = 0;
int i, len, rv;
memset(&ls->ls_remove_lens, 0, sizeof(int) * DLM_REMOVE_NAMES_MAX);
spin_lock(&ls->ls_rsbtbl[b].lock);
+
+ if (!(ls->ls_rsbtbl[b].flags & DLM_RTF_SHRINK)) {
+ spin_unlock(&ls->ls_rsbtbl[b].lock);
+ return;
+ }
+
for (n = rb_first(&ls->ls_rsbtbl[b].toss); n; n = next) {
next = rb_next(n);
r = rb_entry(n, struct dlm_rsb, res_hashnode);
@@ -1679,6 +1687,8 @@ static void shrink_bucket(struct dlm_ls *ls, int b)
continue;
}
+ need_shrink = 1;
+
if (!time_after_eq(jiffies, r->res_toss_time +
dlm_config.ci_toss_secs * HZ)) {
continue;
@@ -1710,6 +1720,11 @@ static void shrink_bucket(struct dlm_ls *ls, int b)
rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[b].toss);
dlm_free_rsb(r);
}
+
+ if (need_shrink)
+ ls->ls_rsbtbl[b].flags |= DLM_RTF_SHRINK;
+ else
+ ls->ls_rsbtbl[b].flags &= ~DLM_RTF_SHRINK;
spin_unlock(&ls->ls_rsbtbl[b].lock);
/*