netdev - Re: [PATCH 2/4] slub,rcu: don't assume the size of struct rcu

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Date:	Tue, 1 Mar 2011 09:11:31 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Pekka Enberg <penberg@...nel.org>
cc:	Lai Jiangshan <laijs@...fujitsu.com>, Ingo Molnar <mingo@...e.hu>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Matt Mackall <mpm@...enic.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 2/4] slub,rcu: don't assume the size of struct rcu_head

On Tue, 1 Mar 2011, Pekka Enberg wrote:

> The SLAB and SLUB patches are fine by me if there are going to be real
> users for this. Christoph, Paul?

The solution is a bit overkill. It would be much simpler to add a union to
struct page that has lru and the rcu in there similar things can be done
for SLAB and the network layer. A similar issue already exists for the
spinlock in struct page. Lets follow the existing way of handling this.

Struct page may be larger for debugging purposes already because of the
need for extended spinlock data.
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