linux-kernel - Re: [PATCH v2 1/2] kmem_cache: include allocators code directly into slab

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Message-ID: <508FF3C8.3070305@parallels.com>
Date:	Tue, 30 Oct 2012 19:35:36 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Christoph Lameter <cl@...ux.com>
CC:	<andi@...stfloor.org>, Pekka Enberg <penberg@...nel.org>,
	<linux-mm@...ck.org>, JoonSoo Kim <js1304@...il.com>,
	<linux-kernel@...r.kernel.org>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH v2 1/2] kmem_cache: include allocators code directly into
 slab_common

On 10/30/2012 07:31 PM, Christoph Lameter wrote:
> On Fri, 26 Oct 2012, JoonSoo Kim wrote:
> 
>> 2012/10/25 Christoph Lameter <cl@...ux.com>:
>>> On Wed, 24 Oct 2012, Pekka Enberg wrote:
>>>
>>>> So I hate this patch with a passion. We don't have any fastpaths in
>>>> mm/slab_common.c nor should we. Those should be allocator specific.
>>>
>>> I have similar thoughts on the issue. Lets keep the fast paths allocator
>>> specific until we find a better way to handle this issue.
>>
>> Okay. I see.
>> How about applying LTO not to the whole kernel code, but just to
>> slab_common.o + sl[aou]b.o?
>> I think that it may be possible, isn't it?
> 
> Well.... Andi: Is that possible?
> 

FYI: In the next version of my series, there is a patch that puts
the common code in an inline function in mm/slab.h. Then the allocators
just call that function.

I think it is the best we can do for now, given all the constraints.


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