netdev - Re: [RFC Patch net-next] net_sched: make classifying lockless on ingress

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Message-ID: <CAM_iQpXYpKE6zAAjFjzAW5KN=u7+C1gapz-bvkmVNFsNi+Jqmw@mail.gmail.com>
Date:	Fri, 20 Dec 2013 16:24:02 -0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	John Fastabend <john.r.fastabend@...el.com>
Subject: Re: [RFC Patch net-next] net_sched: make classifying lockless on ingress

On Fri, Dec 20, 2013 at 4:08 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Fri, 2013-12-20 at 15:57 -0800, Cong Wang wrote:
>
>> Just push the lock down to ->enqueue() ? Since ingress qdisc is classless
>> and its ->dequeue() is nop.
>
>
> https://github.com/jrfastab/Linux-Kernel-QOS
>
> https://github.com/jrfastab/Linux-Kernel-QOS/commit/67746f95acd77cf15d7ce34f644b76058ce19813
>

It's a nice idea to introduce a ->prequeue().

And so brave to play with RCU on singly linked list... maybe I can
just steal the ->prequeue() piece. John? :-D

BTW, the last commit is about 5 months ago...
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