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Date:	Wed, 17 Sep 2014 11:58:40 -0700
From:	Martin Kelly <>
To:	Eric Dumazet <>
Cc:	David Miller <>,,
	Paul McKenney <>,
	Stephen Hemminger <>
Subject: Re: Question about synchronize_net() in AF_PACKET close()

On Wed, Sep 17, 2014 at 10:52 AM, Eric Dumazet <> wrote:
> I have a plan to remove the nulls support for UDP stack, because we
> would like to be able to use million of connected UDP sockets, and we
> would like to get rid of the atomic_inc()/atomic_dec() on socket
> refcount for every incoming message ;)
> My plan was to add a way for a socket to be freed after one rcu grace
> period.
> It would be an opt-in for protocols needing this. TCP stack would
> continue to use SLAB_DESTROY_BY_RCU.
> af_packet could immediately use this, and not have to use
> synchronize_net() at all.
That sounds like a great idea. Do you have a rough estimate of how
long that work will take or what will be required?
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