From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752828AbaAPQpv (ORCPT ); Thu, 16 Jan 2014 11:45:51 -0500 Received: from qmta08.emeryville.ca.mail.comcast.net ([76.96.30.80]:36257 "EHLO qmta08.emeryville.ca.mail.comcast.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752359AbaAPQpt (ORCPT ); Thu, 16 Jan 2014 11:45:49 -0500 Date: Thu, 16 Jan 2014 10:45:47 -0600 (CST) From: Christoph Lameter X-X-Sender: cl@nuc To: Dave Hansen cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, penberg@kernel.org Subject: Re: [RFC][PATCH 2/9] mm: slub: abstract out double cmpxchg option In-Reply-To: <52D5AEF7.6020707@sr71.net> Message-ID: References: <20140114180042.C1C33F78@viggo.jf.intel.com> <20140114180046.C897727E@viggo.jf.intel.com> <52D5AEF7.6020707@sr71.net> Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 14 Jan 2014, Dave Hansen wrote: > On 01/14/2014 11:49 AM, Christoph Lameter wrote: > > On Tue, 14 Jan 2014, Dave Hansen wrote: > >> I found this useful to have in my testing. I would like to have > >> it available for a bit, at least until other folks have had a > >> chance to do some testing with it. > > > > I dont really see the point of this patch since we already have > > CONFIG_HAVE_ALIGNED_STRUCT_PAGE to play with. > > With the current code, if you wanted to turn off the double-cmpxchg abd > get a 56-byte 'struct page' how would you do it? Can you do it with a > .config, or do you need to hack the code? Remove HAVE_ALIGNED_STRUCT_PAGE from a Kconfig file.