netdev - Re: [PATCH] netfilter: per netns nf_conntrack

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Date:	Mon, 01 Feb 2010 16:02:28 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	Patrick McHardy <kaber@...sh.net>,
	Jon Masters <jonathan@...masters.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	netfilter-devel <netfilter-devel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH] netfilter: per netns nf_conntrack_cachep

Le lundi 01 février 2010 à 16:58 +0200, Alexey Dobriyan a écrit :
> On Mon, Feb 1, 2010 at 4:52 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> > +       net->ct.nf_conntrack_cachep = kmem_cache_create("nf_conntrack",
> > +                                                       sizeof(struct nf_conn), 0,
> > +                                                       SLAB_DESTROY_BY_RCU, NULL);
> 
> Duplicate slab name detected.
> 

OK, need to build an unique name I guess... "nf_conntrack-%d", net->id

> Can we clarify this?
> 
> Is checking for ct->ct_net enough to avoid the bug
> while maintaining per-netns/global status quo?

No, I am afraid its not possible without adding big overhead in
fastpath.



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