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Date: Tue, 14 Jan 2014 13:41:11 -0800
From: Dave Hansen <dave@sr71.net>
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To: Christoph Lameter <cl@linux.com>
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
References: <20140114180042.C1C33F78@viggo.jf.intel.com> <20140114180046.C897727E@viggo.jf.intel.com> <alpine.DEB.2.10.1401141346310.19618@nuc>
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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?