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Message-ID: <20090701064108.GB4876@ff.dom.local>
Date: Wed, 1 Jul 2009 06:41:08 +0000
From: Jarek Poplawski <jarkao2@...il.com>
To: Paweł Staszewski <pstaszewski@...are.pl>
Cc: Linux Network Development list <netdev@...r.kernel.org>
Subject: Re: [PATCH net-2.6] Re: rib_trie / Fix inflate_threshold_root.
Now=15 size=11 bits
On Wed, Jul 01, 2009 at 06:36:51AM +0000, Jarek Poplawski wrote:
...
> So here is the first of 2 patches (the second in a separate message),
> which should be tested separately, each one applied on top of the
> 2.6.29.x (vanilla - at least fib_trie.c), after reverting the previous
> one. So, they are again all-in-one, to eclude any misunderstanding.
>
> Btw., I assume there were no oopses, warnings or lockups after those
> previous non-working patches - only no routing/forwarding.
The second patch.
Jarek P.
----------> (synchronize take 7 all-in-one for 2.6.29x, .28, or .27)
diff -Nurp a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
--- a/net/ipv4/fib_trie.c 2009-07-01 06:17:08.000000000 +0000
+++ b/net/ipv4/fib_trie.c 2009-07-01 05:27:02.000000000 +0000
@@ -123,6 +123,7 @@ struct tnode {
union {
struct rcu_head rcu;
struct work_struct work;
+ struct tnode *tnode_free;
};
struct node *child[0];
};
@@ -161,6 +162,8 @@ static void tnode_put_child_reorg(struct
static struct node *resize(struct trie *t, struct tnode *tn);
static struct tnode *inflate(struct trie *t, struct tnode *tn);
static struct tnode *halve(struct trie *t, struct tnode *tn);
+/* tnodes to free after resize(); protected by RTNL */
+static struct tnode *tnode_free_head;
static struct kmem_cache *fn_alias_kmem __read_mostly;
static struct kmem_cache *trie_leaf_kmem __read_mostly;
@@ -385,6 +388,24 @@ static inline void tnode_free(struct tno
call_rcu(&tn->rcu, __tnode_free_rcu);
}
+static void tnode_free_safe(struct tnode *tn)
+{
+ BUG_ON(IS_LEAF(tn));
+ tn->tnode_free = tnode_free_head;
+ tnode_free_head = tn;
+}
+
+static void tnode_free_flush(void)
+{
+ struct tnode *tn;
+
+ while ((tn = tnode_free_head)) {
+ tnode_free_head = tn->tnode_free;
+ tn->tnode_free = NULL;
+ tnode_free(tn);
+ }
+}
+
static struct leaf *leaf_new(void)
{
struct leaf *l = kmem_cache_alloc(trie_leaf_kmem, GFP_KERNEL);
@@ -495,7 +516,7 @@ static struct node *resize(struct trie *
/* No children */
if (tn->empty_children == tnode_child_length(tn)) {
- tnode_free(tn);
+ tnode_free_safe(tn);
return NULL;
}
/* One child */
@@ -509,7 +530,7 @@ static struct node *resize(struct trie *
/* compress one level */
node_set_parent(n, NULL);
- tnode_free(tn);
+ tnode_free_safe(tn);
return n;
}
/*
@@ -670,7 +691,7 @@ static struct node *resize(struct trie *
/* compress one level */
node_set_parent(n, NULL);
- tnode_free(tn);
+ tnode_free_safe(tn);
return n;
}
@@ -756,7 +777,7 @@ static struct tnode *inflate(struct trie
put_child(t, tn, 2*i, inode->child[0]);
put_child(t, tn, 2*i+1, inode->child[1]);
- tnode_free(inode);
+ tnode_free_safe(inode);
continue;
}
@@ -801,9 +822,9 @@ static struct tnode *inflate(struct trie
put_child(t, tn, 2*i, resize(t, left));
put_child(t, tn, 2*i+1, resize(t, right));
- tnode_free(inode);
+ tnode_free_safe(inode);
}
- tnode_free(oldtnode);
+ tnode_free_safe(oldtnode);
return tn;
nomem:
{
@@ -885,7 +906,7 @@ static struct tnode *halve(struct trie *
put_child(t, newBinNode, 1, right);
put_child(t, tn, i/2, resize(t, newBinNode));
}
- tnode_free(oldtnode);
+ tnode_free_safe(oldtnode);
return tn;
nomem:
{
@@ -983,12 +1004,16 @@ fib_find_node(struct trie *t, u32 key)
return NULL;
}
-static struct node *trie_rebalance(struct trie *t, struct tnode *tn)
+static void trie_rebalance(struct trie *t, struct tnode *tn, bool sync)
{
int wasfull;
- t_key cindex, key = tn->key;
+ t_key cindex, key;
struct tnode *tp;
+ if (sync)
+ synchronize_rcu();
+ key = tn->key;
+
while (tn != NULL && (tp = node_parent((struct node *)tn)) != NULL) {
cindex = tkey_extract_bits(key, tp->pos, tp->bits);
wasfull = tnode_full(tp, tnode_get_child(tp, cindex));
@@ -999,6 +1024,10 @@ static struct node *trie_rebalance(struc
tp = node_parent((struct node *) tn);
if (!tp)
+ rcu_assign_pointer(t->trie, (struct node *)tn);
+
+ tnode_free_flush();
+ if (!tp)
break;
tn = tp;
}
@@ -1007,7 +1036,10 @@ static struct node *trie_rebalance(struc
if (IS_TNODE(tn))
tn = (struct tnode *)resize(t, (struct tnode *)tn);
- return (struct node *)tn;
+ rcu_assign_pointer(t->trie, (struct node *)tn);
+ tnode_free_flush();
+
+ return;
}
/* only used from updater-side */
@@ -1155,7 +1187,7 @@ static struct list_head *fib_insert_node
/* Rebalance the trie */
- rcu_assign_pointer(t->trie, trie_rebalance(t, tp));
+ trie_rebalance(t, tp, true);
done:
return fa_head;
}
@@ -1575,7 +1607,7 @@ static void trie_leaf_remove(struct trie
if (tp) {
t_key cindex = tkey_extract_bits(l->key, tp->pos, tp->bits);
put_child(t, (struct tnode *)tp, cindex, NULL);
- rcu_assign_pointer(t->trie, trie_rebalance(t, tp));
+ trie_rebalance(t, tp, false);
} else
rcu_assign_pointer(t->trie, NULL);
--
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