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 12:12:38 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Eric Dumazet <eric.dumazet@...il.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

On Thu, 16 Dec 2010 20:58:39 +0100
Eric Dumazet <eric.dumazet@...il.com> wrote:

> Le jeudi 16 décembre 2010 à 09:57 -0800, Stephen Hemminger a écrit :
> > On Thu, 16 Dec 2010 18:53:06 +0100
> > Eric Dumazet <eric.dumazet@...il.com> wrote:
> > 
> > > @@ -759,7 +742,7 @@ static struct xt_counters *alloc_counters(const struct xt_table *table)
> > >  	 * about).
> > >  	 */
> > >  	countersize = sizeof(struct xt_counters) * private->number;
> > > -	counters = vmalloc(countersize);
> > > +	counters = vzalloc(countersize);
> > >  
> > >  	if (counters == NULL)
> > >  		return ERR_PTR(-ENOMEM);
> > > @@ -1007,7 +990,7 @@ static int __do_replace(struct net *net, const char *name,
> > >  	struct arpt_entry *iter;
> > >  
> > >  	ret = 0;
> > > -	counters = vmalloc(num_counters * sizeof(struct xt_counters));
> > > +	counters = vzalloc(num_counters * sizeof(struct xt_counters));
> > >  	if (!counters) {
> > >  		ret = -ENOMEM;
> > >  		goto out;
> > 
> > This seems like a different and unrelated change.
> > 
> 
> Since you later Acked the patch, you probably know that we now provide
> to get_counters() a zeroed area, since we do a sum for each possible
> cpu, I am answering anyway for other readers ;)
> 
> Thanks for reviewing !

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. 

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