netdev - Re: [net-next PATCH v3 3/4] net: sched: restrict use of qstats qlen

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Date:	Tue, 30 Sep 2014 01:03:06 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	john.fastabend@...il.com
Cc:	xiyou.wangcong@...il.com, jhs@...atatu.com, eric.dumazet@...il.com,
	netdev@...r.kernel.org
Subject: Re: [net-next PATCH v3 3/4] net: sched: restrict use of qstats qlen

From: John Fastabend <john.fastabend@...il.com>
Date: Sun, 28 Sep 2014 11:53:57 -0700

> This removes the use of qstats->qlen variable from the classifiers
> and makes it an explicit argument to gnet_stats_copy_queue().
> 
> The qlen represents the qdisc queue length and is packed into
> the qstats at the last moment before passnig to user space. By
> handling it explicitely we avoid, in the percpu stats case, having
> to figure out which per_cpu variable to put it in.
> 
> It would probably be best to remove it from qstats completely
> but qstats is a user space ABI and can't be broken. A future
> patch could make an internal only qstats structure that would
> avoid having to allocate an additional u32 variable on the
> Qdisc struct. This would make the qstats struct 128bits instead
> of 128+32.
> 
> Signed-off-by: John Fastabend <john.r.fastabend@...el.com>

Applied.
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