netdev - Re: [PATCH] Traffic control cgroups subsystem

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Date:	Tue, 22 Jul 2008 14:48:42 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Paul Menage <menage@...gle.com>
CC:	Ranjit Manomohan <ranjitm@...gle.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	lizf@...fujitsu.com
Subject: Re: [PATCH] Traffic control cgroups subsystem

Paul Menage wrote:
> On Tue, Jul 22, 2008 at 6:35 AM, Patrick McHardy <kaber@...sh.net> wrote:
>> Does this really have to be a new skb member? You could
>> simply use skb->sk->sk_cgroup_classid directly, or if
>> that doesn't work, maybe skb->priority.
>>
> 
> We were actually using skb->priority in our internal version of this
> patch. I suggested that the separate cgroup_classid field be added
> since it might be considered an abuse of skb->priority and would
> interfere with existing users of that. If that's not an issue then
> reusing skb->priority is certainly possible.

Using skb->priority for classification would be fine, but it would
probably interfere with the default initialization to sk->sk_priority.

> Regarding skb->sk->sk_cgroup_classid, is it always the case that the
> original sk is still available when we're making traffic control
> decisions? I'd thought that there were cases (e.g. cloning skbs in the
> TCP retransmit path) where the pointer to the original sk is lost.

After cloning, TCP sets the owner of the skb to the socket, so
that should work fine.
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