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

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Message-ID: <52D81331.5080209@sr71.net>
Date:	Thu, 16 Jan 2014 09:13:21 -0800
From:	Dave Hansen <dave@...1.net>
To:	Christoph Lameter <cl@...ux.com>
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 01/16/2014 08:45 AM, Christoph Lameter wrote:
> On Tue, 14 Jan 2014, Dave Hansen wrote:
>> 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.

SLUB 'selects' it, so it seems to pop back up whenever SLUB is on:

$ grep STRUCT_PAGE ~/build/64bit/.config
CONFIG_HAVE_ALIGNED_STRUCT_PAGE=y
$ vi ~/build/64bit/.config
... remove from Kconfig file
$ grep STRUCT_PAGE ~/build/64bit/.config
$ make oldconfig
... no prompt
$ grep STRUCT_PAGE ~/build/64bit/.config
CONFIG_HAVE_ALIGNED_STRUCT_PAGE=y


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