Re: [PATCH v7 10/16] dlm: use new hashtable implementation

Mathieu Desnoyers
2012-10-29T12:46:59Z

* Sasha Levin (levinsasha928@gmail.com) wrote:
[...]
> @@ -158,34 +159,21 @@ static int dlm_allow_conn;
> static struct workqueue_struct *recv_workqueue;
> static struct workqueue_struct *send_workqueue;
>
> -static struct hlist_head connection_hash[CONN_HASH_SIZE];
> +static struct hlist_head connection_hash[CONN_HASH_BITS];
> static DEFINE_MUTEX(connections_lock);
> static struct kmem_cache *con_cache;
>
> static void process_recv_sockets(struct work_struct *work);
> static void process_send_sockets(struct work_struct *work);
>
> -
> -/* This is deliberately very simple because most clusters have simple
> - sequential nodeids, so we should be able to go straight to a connection
> - struct in the array */
> -static inline int nodeid_hash(int nodeid)
> -{
> - return nodeid & (CONN_HASH_SIZE-1);
> -}

There is one thing I dislike about this change: you remove a useful
comment. It's good to be informed of the reason why a direct mapping
"value -> hash" without any dispersion function is preferred here.

Thanks,

Mathieu

--
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.