netdev - Re: [PATCH RFC] act_cpu: packet distributing

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Date:	Thu, 15 Jul 2010 08:48:59 -0400
From:	jamal <hadi@...erus.ca>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Patrick McHardy <kaber@...sh.net>,
	Tom Herbert <therbert@...gle.com>, netdev@...r.kernel.org
Subject: Re: [PATCH RFC] act_cpu: packet distributing

On Wed, 2010-07-14 at 12:17 +0800, Changli Gao wrote:

> Thanks, I'll try. It is a write critical section, and for me it is
> difficult to convert this lock to RCU. Could you show me some
> examples?

RCU maybe a little trickier here Eric. Actions could be shared i.e. 
example, it is possible to have a policer action restricting rates for a
group of flows  across multiple netdevices etc. Since action stats get
written to by different CPUs concurrently. It could be probably done if
one was to implement per-cpu stats which get summed-up when user space
asks.

cheers,
jamal

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