linux-kernel - Re: [PATCH] tree/tiny rcu: Add debug RCU head option (v2)

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Message-ID: <20100322155616.GI2517@linux.vnet.ibm.com>
Date:	Mon, 22 Mar 2010 08:56:16 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <laijs@...fujitsu.com>, mingo@...e.hu,
	akpm@...ux-foundation.org, dipankar@...ibm.com,
	josh@...htriplett.org, dvhltc@...ibm.com, niv@...ibm.com,
	tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
	Valdis.Kletnieks@...edu, dhowells@...hat.com,
	eric.dumazet@...il.com, Alexey Dobriyan <adobriyan@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [PATCH] tree/tiny rcu: Add debug RCU head option (v2)

On Mon, Mar 22, 2010 at 09:37:55AM -0500, Christoph Lameter wrote:
> SLAB overloads "struct slab" with the rcu_head. Its not that critical
> there since the metadata allocated for each slab page is larger. SLUB does
> not have such a per slab page metadata structure and limits its metadata
> to what is available in the page struct.

Thank you for the info!

FWIW, Mathieu is now using debug objects, which permits him to keep
rcu_head the same size.

							Thanx, Paul
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