netdev - Re: [rfc 10/13] [RFC 10/13] IPVS: management of persistence engine modules

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Message-ID: <20100805092920.7573c96b@nehalam>
Date:	Thu, 5 Aug 2010 09:29:20 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Simon Horman <horms@...ge.net.au>
Cc:	lvs-devel@...r.kernel.org, netdev@...r.kernel.org,
	netfilter@...r.kernel.org, netfilter-devel@...r.kernel.org,
	Wensong Zhang <wensong@...ux-vs.org>,
	Julian Anastasov <ja@....bg>, Patrick McHardy <kaber@...sh.net>
Subject: Re: [rfc 10/13] [RFC 10/13] IPVS: management of persistence engine
 modules

On Thu, 05 Aug 2010 20:48:05 +0900
Simon Horman <horms@...ge.net.au> wrote:

> +/* lock for service table */
> +static DEFINE_RWLOCK(__ip_vs_pe_lock);

It is already static so why the __?
Reader/writer locks are slower than spinlocks.  Either use
a spinlock, or RCU (if possible)

> +/* Bind a service with a pe */
> +void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe)
> +{
> +	svc->pe = pe;
> +}
> +
> +/* Unbind a service from its pe */
> +void ip_vs_unbind_pe(struct ip_vs_service *svc)
> +{
> +	svc->pe = NULL;
> +}

What does having these wrappers buy?
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