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authorPatrick McHardy <kaber@trash.net>2008-07-05 23:22:53 -0700
committerDavid S. Miller <davem@davemloft.net>2008-07-05 23:22:53 -0700
commit4207759939c208f24d7e09596753e67b6bc188f9 (patch)
tree90b2cb3e740100a947f40a916b862eae099299ce /net
parentf4c1f3e0c59be0e6566d9c00b1d8b204ffb861a2 (diff)
net-sched: sch_htb: remove child and sibling lists
Now that the qdisc isn't destroyed in hierarchical order anymore, the only user of the child lists left is htb_parent_last_child(). This can be easily changed to use a counter of children to save a few bytes. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/sched/sch_htb.c21
1 files changed, 7 insertions, 14 deletions
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index e7461a17d71..128a5ab2e37 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -81,9 +81,8 @@ struct htb_class {
/* topology */
int level; /* our level (see above) */
+ unsigned int children;
struct htb_class *parent; /* parent class */
- struct list_head sibling; /* sibling list item */
- struct list_head children; /* children list */
union {
struct htb_class_leaf {
@@ -138,7 +137,6 @@ static inline long L2T(struct htb_class *cl, struct qdisc_rate_table *rate,
}
struct htb_sched {
- struct list_head root; /* root classes list */
struct Qdisc_class_hash clhash;
struct list_head drops[TC_HTB_NUMPRIO];/* active leaves (for drops) */
@@ -1020,7 +1018,6 @@ static int htb_init(struct Qdisc *sch, struct nlattr *opt)
return -EINVAL;
}
- INIT_LIST_HEAD(&q->root);
err = qdisc_class_hash_init(&q->clhash);
if (err < 0)
return err;
@@ -1175,12 +1172,9 @@ static inline int htb_parent_last_child(struct htb_class *cl)
if (!cl->parent)
/* the root class */
return 0;
-
- if (!(cl->parent->children.next == &cl->sibling &&
- cl->parent->children.prev == &cl->sibling))
+ if (cl->parent->children > 1)
/* not the last child */
return 0;
-
return 1;
}
@@ -1259,7 +1253,7 @@ static int htb_delete(struct Qdisc *sch, unsigned long arg)
// TODO: why don't allow to delete subtree ? references ? does
// tc subsys quarantee us that in htb_destroy it holds no class
// refs so that we can remove children safely there ?
- if (!list_empty(&cl->children) || cl->filter_cnt)
+ if (cl->children || cl->filter_cnt)
return -EBUSY;
if (!cl->level && htb_parent_last_child(cl)) {
@@ -1278,7 +1272,7 @@ static int htb_delete(struct Qdisc *sch, unsigned long arg)
/* delete from hash and active; remainder in destroy_class */
qdisc_class_hash_remove(&q->clhash, &cl->common);
- list_del(&cl->sibling);
+ cl->parent->children--;
if (cl->prio_activity)
htb_deactivate(q, cl);
@@ -1373,8 +1367,7 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
&sch->dev->queue_lock,
tca[TCA_RATE] ? : &est.nla);
cl->refcnt = 1;
- INIT_LIST_HEAD(&cl->sibling);
- INIT_LIST_HEAD(&cl->children);
+ cl->children = 0;
INIT_LIST_HEAD(&cl->un.leaf.drop_list);
RB_CLEAR_NODE(&cl->pq_node);
@@ -1420,8 +1413,8 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
/* attach to the hash list and parent's family */
qdisc_class_hash_insert(&q->clhash, &cl->common);
- list_add_tail(&cl->sibling,
- parent ? &parent->children : &q->root);
+ if (parent)
+ parent->children++;
} else {
if (tca[TCA_RATE])
gen_replace_estimator(&cl->bstats, &cl->rate_est,