netdev - Re: [PATCH net-next] Revert "selinux: add a skb_owned

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Date:	Fri, 20 Mar 2015 21:39:09 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	edumazet@...gle.com
Cc:	netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH net-next] Revert "selinux: add a skb_owned_by() hook"

From: Eric Dumazet <edumazet@...gle.com>
Date: Fri, 20 Mar 2015 17:15:19 -0700

> This reverts commit ca10b9e9a8ca7342ee07065289cbe74ac128c169.
> 
> No longer needed after commit eb8895debe1baba41fcb62c78a16f0c63c21662a
> ("tcp: tcp_make_synack() should use sock_wmalloc")
> 
> When under SYNFLOOD, we build lot of SYNACK and hit false sharing
> because of multiple modifications done on sk_listener->sk_wmem_alloc
> 
> Since tcp_make_synack() uses sock_wmalloc(), there is no need
> to call skb_set_owner_w() again, as this adds two atomic operations.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied.
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