netdev - Re: rib_trie / Fix inflate_threshold

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Date:	Fri, 26 Jun 2009 22:26:53 +0200
From:	Robert Olsson <robert@...ur.slu.se>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Robert Olsson <Robert.Olsson@...a.slu.se>,
	Eric Dumazet <dada1@...mosbay.com>,
	=?ISO-8859-2?Q?Pawe=B3_Staszewski?= 
	<pstaszewski@...are.pl>, Robert Olsson <robert.olsson@....uu.se>,
	Linux Network Development list <netdev@...r.kernel.org>
Subject: Re: rib_trie / Fix inflate_threshold_root. Now=15 size=11 bits



Yes looks like a good solution but maybe it safest to synchronize unconditionally?


diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 012cf5a..9cb8623 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1028,8 +1028,11 @@ static void trie_rebalance(struct trie *t, struct tnode *tn)
 	}
 
 	/* Handle last (top) tnode */
-	if (IS_TNODE(tn))
+	if (IS_TNODE(tn)) {
+		/* force memory freeing after last changes */
+		synchronize_rcu();
 		tn = (struct tnode *)resize(t, (struct tnode *)tn);
+	}
 
 	rcu_assign_pointer(t->trie, (struct node *)tn);
 	tnode_free_flush();

Cheers
						--ro

Jarek Poplawski writes:

 >  net/ipv4/fib_trie.c |    8 ++++++--
 >  1 files changed, 6 insertions(+), 2 deletions(-)
 > 
 > diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
 > index 012cf5a..98b31a1 100644
 > --- a/net/ipv4/fib_trie.c
 > +++ b/net/ipv4/fib_trie.c
 > @@ -1008,7 +1008,7 @@ static void trie_rebalance(struct trie *t, struct tnode *tn)
 >  {
 >  	int wasfull;
 >  	t_key cindex, key;
 > -	struct tnode *tp;
 > +	struct tnode *tp, *oldtnode = tn;
 >  
 >  	key = tn->key;
 >  
 > @@ -1028,8 +1028,12 @@ static void trie_rebalance(struct trie *t, struct tnode *tn)
 >  	}
 >  
 >  	/* Handle last (top) tnode */
 > -	if (IS_TNODE(tn))
 > +	if (IS_TNODE(tn)) {
 > +		/* force memory freeing after last changes */
 > +		if (oldtnode != tn)
 > +			synchronize_rcu();
 >  		tn = (struct tnode *)resize(t, (struct tnode *)tn);
 > +	}
 >  
 >  	rcu_assign_pointer(t->trie, (struct node *)tn);
 >  	tnode_free_flush();
 > --
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