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

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Message-ID: <AANLkTimXy2Yaj+NTDMNTWuLqHHfKZJhVDpeXj3CfMvBf@mail.gmail.com>
Date:	Tue, 1 Mar 2011 15:00:02 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	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, Mar 1, 2011 at 10:03 AM, Lai Jiangshan <laijs@...fujitsu.com> wrote:
> The size of struct rcu_head may be changed. When it becomes larger,
> it will pollute the page array.
>
> We reserve some some bytes for struct rcu_head when a slab
> is allocated in this situation.
>
> Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>

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