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

[Dave Hansen]

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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