netdev - Re: [RFC 6/6] fib_trie: combine leaf and info

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Date:	Tue, 15 Jan 2008 19:10:31 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Stephen Hemminger <stephen.hemminger@...tta.com>
Cc:	Robert Olsson <Robert.Olsson@...a.slu.se>,
	David Miller <davem@...emloft.net>, robert.olsson@....uu.se,
	netdev@...r.kernel.org
Subject: Re: [RFC 6/6] fib_trie: combine leaf and info

On Tue, 15 Jan 2008 09:47:53 -0800
Stephen Hemminger <stephen.hemminger@...tta.com> wrote:

> This is how I did it:
> 
> --- a/net/ipv4/fib_trie.c	2008-01-15 09:14:53.000000000 -0800
> +++ b/net/ipv4/fib_trie.c	2008-01-15 09:21:48.000000000 -0800
> @@ -101,13 +101,6 @@ struct node {
>  	t_key key;
>  };
>  
> -struct leaf {
> -	unsigned long parent;
> -	t_key key;
> -	struct hlist_head list;
> -	struct rcu_head rcu;
> -};
> -
>  struct leaf_info {
>  	struct hlist_node hlist;
>  	struct rcu_head rcu;
> @@ -115,6 +108,13 @@ struct leaf_info {
>  	struct list_head falh;
>  };
>  
> +struct leaf {
> +	unsigned long parent;
> +	t_key key;
> +	struct hlist_head list;
> +	struct rcu_head rcu;
> +};

I like this :)

Your design is clean, but we waste some space (rcu in leaf_info "included"), we probably can do a litle bit better
(moving rcu at the end of leaf_info, and kmem_cache_create("ip_fib_trie", sizeof(struct leaf) + sizeof(struct_leaf_info) - sizeof(struct rcu_head))

 
> -	trie_leaf_kmem = kmem_cache_create("ip_fib_trie", sizeof(struct leaf),
> +	trie_leaf_kmem = kmem_cache_create("ip_fib_trie",
> +					   sizeof(struct leaf) + sizeof(struct leaf_info),
>  					   0, SLAB_PANIC, NULL);
>  }
>  
> 

Thank you
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