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

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Date:	Mon, 29 Oct 2012 08:46:55 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	torvalds@...ux-foundation.org, tj@...nel.org,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
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Subject: Re: [PATCH v7 10/16] dlm: use new hashtable implementation

* Sasha Levin (levinsasha928@...il.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.
http://www.efficios.com
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