linux-kernel - Re: [PATCH] slub: fix slab_pad_check() and SLAB_DESTROY_BY

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Message-ID: <alpine.DEB.1.10.0909031244230.27903@V090114053VZO-1>
Date:	Thu, 3 Sep 2009 12:45:43 -0500 (CDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Zdenek Kabelac <zdenek.kabelac@...il.com>,
	Patrick McHardy <kaber@...sh.net>, Robin Holt <holt@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jesper Dangaard Brouer <hawk@...x.dk>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Netfilter Developers <netfilter-devel@...r.kernel.org>,
	paulmck@...ux.vnet.ibm.com
Subject: Re: [PATCH] slub: fix slab_pad_check() and SLAB_DESTROY_BY_RCU

On Thu, 3 Sep 2009, Eric Dumazet wrote:

> on a SLAB_DESTROY_BY_RCU cache, there is no need to try to optimize this
> rcu_barrier() call, unless we want superfast reboot/halt sequences...

I stilll think that the action to quiesce rcu is something that the caller
of kmem_cache_destroy must take care of.

Could you split this into two patches: One that addresses the poison and
another that deals with rcu?

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