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Date: Wed, 9 Sep 2009 10:04:20 -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 Tue, 8 Sep 2009, Paul E. McKenney wrote:
> > 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.
I'd rather have the call_rcu in the slabs replaced by a function that
can be set by the user. Then we can remove all rcu barriers from the code
and the slabs could be used with any type of rcu functionality.
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