netdev - Re: [PATCH] slub: fix slab_pad

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Message-ID: <alpine.DEB.1.10.0909081555410.26382@V090114053VZO-1>
Date:	Tue, 8 Sep 2009 15:57:04 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
cc:	Eric Dumazet <eric.dumazet@...il.com>,
	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>
Subject: Re: [PATCH] slub: fix slab_pad_check()

On Fri, 4 Sep 2009, Paul E. McKenney wrote:

> We have gotten along fine with only SLAB_DESTROY_BY_RCU for almost
> five years, so I think we are plenty fine with what we have.  So, as
> you say, "as the need arises".

These were the glory years where SLAB_DESTROY_BY_RCU was only used for
anonymous vmas. Now Eric has picked it up for the net subsystem. You may
see the RCU use proliferate.

The kmem_cache_destroy rcu barriers did not matter until
SLAB_DESTROY_BY_RCU spread.


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