netdev - Re: [PATCH v3 10/12] l2tp: Add L2TP ethernet pseudowire support

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Date:	Tue, 30 Mar 2010 09:32:52 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	James Chapman <jchapman@...alix.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH v3 10/12] l2tp: Add L2TP ethernet pseudowire support

On Tue, 30 Mar 2010 17:18:19 +0100
James Chapman <jchapman@...alix.com> wrote:

> +struct l2tp_eth_net {
> +	struct list_head l2tp_eth_dev_list;
> +	rwlock_t l2tp_eth_lock;
> +};

Reader/write locks are discouraged because they are slower than
spin locks.  If you have lots of readers use RCU, if reading
is infrequent just use a spin lock.

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