From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Paul E. McKenney" Subject: Re: [PATCH] slub: fix slab_pad_check() Date: Tue, 8 Sep 2009 15:59:37 -0700 Message-ID: <20090908225937.GO6753@linux.vnet.ibm.com> References: <4A9FDA72.8060001@gmail.com> <4AA00400.1030005@gmail.com> <20090903231757.GP6761@linux.vnet.ibm.com> <20090904204335.GG6751@linux.vnet.ibm.com> <20090908222036.GM6753@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Eric Dumazet , Pekka Enberg , Zdenek Kabelac , Patrick McHardy , Robin Holt , Linux Kernel Mailing List , Jesper Dangaard Brouer , Linux Netdev List , Netfilter Developers To: Christoph Lameter Return-path: Received: from e7.ny.us.ibm.com ([32.97.182.137]:43613 "EHLO e7.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752787AbZIHW7f (ORCPT ); Tue, 8 Sep 2009 18:59:35 -0400 Content-Disposition: inline In-Reply-To: Sender: netfilter-devel-owner@vger.kernel.org List-ID: 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