linux-kernel - Re: [PATCH] netfilter: xtables: stackptr should be percpu

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Date:	Mon, 31 May 2010 15:44:08 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jan Engelhardt <jengelh@...ozas.de>
Cc:	Xiaotian Feng <dfeng@...hat.com>, netfilter-devel@...r.kernel.org,
	netfilter@...r.kernel.org, coreteam@...filter.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [PATCH] netfilter: xtables: stackptr should be percpu

Le lundi 31 mai 2010 à 15:22 +0200, Jan Engelhardt a écrit :
> On Monday 2010-05-31 15:13, Eric Dumazet wrote:
> >
> >All cpus share a single cache line for their 'stackptr' storage,
> >introduced in commit f3c5c1bfd4
> >
> >This is a stable candidate (2.6.34)
> 
> Stackptr was first introduced for 2.6.35-rcX.
> 

Indeed, I was fooled by 'git describe'

> >+	i->stackptr = alloc_percpu(unsigned int);
> > 	if (i->stackptr == NULL)
> > 		return -ENOMEM;
> >-	memset(i->stackptr, 0, size);
> > 
> > 	size = sizeof(void **) * nr_cpu_ids;
> > 	if (size > PAGE_SIZE)
> 
> Are alloc_percpu areas cleared?
> 

Yes, allocated chunks are cleared.


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