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

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Message-ID: <alpine.DEB.2.00.1003220935370.15360@router.home>
Date:	Mon, 22 Mar 2010 09:37:55 -0500 (CDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
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)

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.



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