netdev - Re: [PATCH v3 net-next-2.6] netfilter: x_tables: dont block BH while reading counters

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Date:	Thu, 16 Dec 2010 21:40:08 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Jesper Dangaard Brouer <hawk@...x.dk>,
	Patrick McHardy <kaber@...sh.net>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Steven Rostedt <srostedt@...hat.com>,
	Alexander Duyck <alexander.h.duyck@...el.com>,
	netfilter-devel <netfilter-devel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
Subject: Re: [PATCH v3 net-next-2.6] netfilter: x_tables: dont block BH
 while reading counters

Le jeudi 16 décembre 2010 à 12:12 -0800, Stephen Hemminger a écrit :
> You changed from:
>   get local cpu counters
>   then sum other cpus
> to:
>   sum all cpu's.
> 
> This is fine, and will give the same answer. 
> 

Yes, I did that because the fetch of individual counters is now more
complex.

I tried to make code smaller and less complex. Eventually we are now
allowed to be preempted and even migrated to another cpu during the
process.


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