linux-kernel - Re: [RFC][PATCH 2/9] mm: slub: abstract out double cmpxchg option

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Message-ID: <alpine.DEB.2.10.1401161045180.29778@nuc>
Date:	Thu, 16 Jan 2014 10:45:47 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Dave Hansen <dave@...1.net>
cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, penberg@...nel.org
Subject: Re: [RFC][PATCH 2/9] mm: slub: abstract out double cmpxchg option

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.

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