netdev - Re: [PATCH] netfilter: use per-CPU r**ursive lock {XV}

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Message-ID: <alpine.DEB.1.10.0904281330390.13862@qirst.com>
Date:	Tue, 28 Apr 2009 13:35:40 -0400 (EDT)
From:	Christoph Lameter <cl@...ux.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
cc:	David Miller <davem@...emloft.net>, mingo@...e.hu,
	dada1@...mosbay.com, torvalds@...ux-foundation.org,
	shemminger@...tta.com, zbr@...emap.net, peterz@...radead.org,
	mathieu.desnoyers@...ymtl.ca, jarkao2@...il.com, paulus@...ba.org,
	kaber@...sh.net, jeff.chua.linux@...il.com, laijs@...fujitsu.com,
	jengelh@...ozas.de, r000n@...0n.net, linux-kernel@...r.kernel.org,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	benh@...nel.crashing.org
Subject: Re: [PATCH] netfilter: use per-CPU r**ursive lock {XV}

On Tue, 28 Apr 2009, Paul E. McKenney wrote:

> > If you can show me have to pass a per-cpu variable (the variable,
> > not a dereference of it) as an argument to an inline function,
> > I'll implement this :-)
> >
> > It has to be dereferenced after local_bh_disable() for the
> > read side acquisition.
>
> The way I did this in treercu.c was to create an array of references
> to the per-CPU data in question.  Not necessarily recommended, but
> one way of doing it.  That said, one could argue that we should wait
> until we have at least three users before creating a generic primitive.

The new percpu allocator allows you to create a per cpu pointer and pass
it to functions.

per_cpu_ptr(pointer,cpu) is used to select an instance.
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