netdev - Re: [PATCH net-next-2.6] net: sk_dst

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Message-Id: <20100413.161153.135265420.davem@davemloft.net>
Date:	Tue, 13 Apr 2010 16:11:53 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, paulmck@...ux.vnet.ibm.com
Subject: Re: [PATCH net-next-2.6] net: sk_dst_cache RCUification

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 14 Apr 2010 01:04:05 +0200

> Instead of using rcu on whole "struct socket", my plan is to use a small
> structure :
> 
> struct wait_queue_head_rcu {
> 	wait_queue_head_t wait;
> 	struct rcu_head	  rcu;
> } ____cacheline_aligned_in_smp;
> 
> and make sk->sk_sleep points to this 'wait' field.

So you're relying upon the fact that in the non-FASYNC case
the struct socket's wait queue is never actually used?
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