linux-kernel - Re: [PATCH V2 1/2] mm: move FAULT_AROUND

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Message-ID: <5344A603.90305@linux.vnet.ibm.com>
Date:	Wed, 09 Apr 2014 07:14:35 +0530
From:	Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
To:	David Miller <davem@...emloft.net>, dave.hansen@...el.com
CC:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-mm@...ck.org, linux-arch@...r.kernel.org, x86@...nel.org,
	benh@...nel.crashing.org, paulus@...ba.org,
	kirill.shutemov@...ux.intel.com, rusty@...tcorp.com.au,
	akpm@...ux-foundation.org, riel@...hat.com, mgorman@...e.de,
	ak@...ux.intel.com, peterz@...radead.org, mingo@...nel.org
Subject: Re: [PATCH V2 1/2] mm: move FAULT_AROUND_ORDER to arch/

On Friday 04 April 2014 11:20 PM, David Miller wrote:
> From: Dave Hansen <dave.hansen@...el.com>
> Date: Fri, 04 Apr 2014 09:18:43 -0700
> 
>> On 04/03/2014 11:27 PM, Madhavan Srinivasan wrote:
>>> This patch creates infrastructure to move the FAULT_AROUND_ORDER
>>> to arch/ using Kconfig. This will enable architecture maintainers
>>> to decide on suitable FAULT_AROUND_ORDER value based on
>>> performance data for that architecture. Patch also adds
>>> FAULT_AROUND_ORDER Kconfig element in arch/X86.
>>
>> Please don't do it this way.
>>
>> In mm/Kconfig, put
>>
>> 	config FAULT_AROUND_ORDER
>> 		int
>> 		default 1234 if POWERPC
>> 		default 4
>>
>> The way you have it now, every single architecture that needs to enable
>> this has to go put that in their Kconfig.  That's madness.  This way,
>> you only put it in one place, and folks only have to care if they want
>> to change the default to be something other than 4.
> 
> It looks more like it's necessary only to change the default, not
> to enable it.  Unless I read his patch wrong...
> 
Yes. With current patch, you only need to change the default by which
you enable it.

With regards
Maddy
> 

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