linux-kernel - Re: [PATCH] slub: fix slab_pad

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Message-ID: <20090908225937.GO6753@linux.vnet.ibm.com>
Date:	Tue, 8 Sep 2009 15:59:37 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
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 Tue, Sep 08, 2009 at 06:41:14PM -0400, Christoph Lameter wrote:
> On Tue, 8 Sep 2009, Paul E. McKenney wrote:
> 
> > Are you saying that people have already asked you for additional
> > variants of SLAB_DESTROY_BY_RCU?  If so, please don't keep them a secret!
> > Otherwise, experience indicates that it is best to wait for the new uses,
> > because they usually aren't quite what one might expect.
> 
> No direct request but I have seen the network developers discover these
> features and their caching benefits over the last year. It is likely that
> they will try to push it into more components of the net subsystem.

So if they push it far enough, they might well decide that they need
a SLAB_DESTROY_BY_RCU_BH, for example.  Looks like seven bits left,
so unless I am missing something, should not be a huge problem should
this need arise.

							Thanx, Paul
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