netdev - Re: [net-next PATCH v3 1/4] net: sched: make bstats per cpu and estimator RCU safe

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Date:	Tue, 30 Sep 2014 01:02:52 -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 1/4] net: sched: make bstats per cpu and
 estimator RCU safe

From: John Fastabend <john.fastabend@...il.com>
Date: Sun, 28 Sep 2014 11:52:56 -0700

> From: John Fastabend <john.fastabend@...il.com>
> 
> In order to run qdisc's without locking statistics and estimators
> need to be handled correctly.
> 
> To resolve bstats make the statistics per cpu. And because this is
> only needed for qdiscs that are running without locks which is not
> the case for most qdiscs in the near future only create percpu
> stats when qdiscs set the TCQ_F_CPUSTATS flag.
> 
> Next because estimators use the bstats to calculate packets per
> second and bytes per second the estimator code paths are updated
> to use the per cpu statistics.
> 
> Signed-off-by: John Fastabend <john.r.fastabend@...el.com>

Applied.
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